Pathology Question Bank

 TWO MARKS QUESTIONS

What is cellular adaptation?
Cellular adaptation is the reversible structural or functional change in cells in response to physiological or pathological stress. These changes help cells survive in altered environments and maintain normal function.

Define inflammation.
Inflammation is the protective response of body tissues to injury, infection, or irritation. It involves vascular changes, migration of white blood cells, and release of chemical mediators to eliminate the harmful stimulus.

What is neoplasia?
Neoplasia refers to uncontrolled and abnormal proliferation of cells resulting in the formation of a tumor or neoplasm. These growths may be benign or malignant depending on their behavior and ability to spread.

What is hypertrophy?
Hypertrophy is an increase in the size of cells leading to enlargement of the affected organ or tissue. It occurs due to increased functional demand or hormonal stimulation without an increase in cell number.

What is atrophy?
Atrophy is the decrease in size and function of cells, tissues, or organs due to loss of cell substance. It commonly occurs because of reduced workload, poor nutrition, aging, or loss of nerve supply.

What is hyperplasia?
Hyperplasia is an increase in the number of cells in a tissue or organ resulting in its enlargement. It occurs due to increased cell division and may be physiological or pathological.

Define cell injury.
Cell injury occurs when cells are exposed to harmful stimuli such as toxins, infection, or lack of oxygen. If the damage is mild, it may be reversible; severe injury can lead to irreversible damage and cell death.

What is apoptosis?
Apoptosis is a form of programmed cell death that occurs in a controlled and regulated manner. It helps eliminate damaged or unnecessary cells without causing inflammation in surrounding tissues.

What is necrosis?
Necrosis is uncontrolled cell death caused by severe injury such as infection, toxins, or trauma. It results in swelling, rupture of the cell membrane, and inflammation in the surrounding tissue.

What is repair in pathology?
Repair is the process by which the body restores damaged tissue after injury. It may occur through regeneration of cells or formation of scar tissue depending on the severity of damage.

What are the cardinal signs of inflammation?
The five cardinal signs of inflammation are redness, heat, swelling, pain, and loss of function. These occur due to increased blood flow, vascular permeability, and accumulation of inflammatory cells.

What is infection?
Infection is the invasion and multiplication of microorganisms such as bacteria, viruses, fungi, or parasites in the body. These organisms cause tissue damage and trigger immune and inflammatory responses.

What are circulatory disorders?
Circulatory disorders are conditions that affect the normal flow of blood through blood vessels. Examples include thrombosis, embolism, ischemia, and infarction, which may lead to tissue damage.

What is thrombosis?
Thrombosis is the formation of a blood clot inside a blood vessel during life. The clot may obstruct blood flow and lead to tissue damage due to reduced oxygen supply.

What is embolism?
Embolism occurs when a detached blood clot or other material travels through the bloodstream and blocks a blood vessel at a distant site, interrupting blood supply to the affected tissue.

What is infarction?
Infarction is the death of tissue caused by prolonged lack of blood supply. It commonly occurs due to blockage of arteries by thrombosis or embolism.

What is immune defense?
Immune defense is the body's protective mechanism against infections and foreign substances. It involves cells such as lymphocytes, antibodies, and immune responses that identify and destroy pathogens.

What is reversible cell injury?
Reversible cell injury is a mild form of cell damage in which the affected cell can return to its normal state once the harmful stimulus is removed. Examples include cellular swelling and fatty change.

What is irreversible cell injury?
Irreversible cell injury occurs when damage to the cell is severe and permanent. The cell loses its ability to recover and eventually undergoes cell death through necrosis or apoptosis.

What is metaplasia?
Metaplasia is a reversible change in which one mature type of cell is replaced by another type of mature cell. It usually occurs as an adaptive response to chronic irritation or stress.

What is regeneration?
Regeneration is the process by which damaged or lost cells are replaced by new cells of the same type. This restores the normal structure and function of the affected tissue.

What is granulation tissue?
Granulation tissue is newly formed connective tissue and tiny blood vessels that develop during the healing process of a wound. It provides the foundation for tissue repair and scar formation.

What are benign tumors?
Benign tumors are non-cancerous growths that grow slowly and remain localized. They usually do not invade nearby tissues or spread to distant organs.

What are malignant tumors?
Malignant tumors are cancerous growths characterized by uncontrolled cell proliferation, invasion of surrounding tissues, and the ability to spread to distant organs through metastasis.

What is metastasis?
Metastasis is the spread of malignant tumor cells from the primary site to distant organs through blood or lymphatic vessels, forming secondary tumors in other parts of the body.

FOUR MARKS  QUESTIONS

What is neoplasia? Explain the characteristics of benign and malignant tumors.
Neoplasia refers to abnormal and uncontrolled growth of cells that forms a mass called a tumor or neoplasm. This growth persists even after the stimulus that caused it has been removed. Neoplasms are broadly classified into benign and malignant tumors. Benign tumors are non-cancerous, grow slowly, remain localized, and usually have a well-defined capsule. They rarely spread to other parts of the body. Examples include lipoma and adenoma. Malignant tumors, on the other hand, are cancerous, grow rapidly, invade surrounding tissues, and have the ability to spread to distant organs through blood or lymphatic vessels, a process known as metastasis. Malignant tumors often show abnormal cell shapes, large nuclei, and increased mitotic activity. Early detection and treatment are essential because malignant tumors can damage organs and may become life-threatening if not controlled.

Explain the process of inflammation and its role in tissue repair.
Inflammation is the protective response of the body to injury, infection, or harmful stimuli. Its main purpose is to eliminate the cause of cell injury, remove damaged tissue, and initiate healing. The process begins with dilation of blood vessels and increased blood flow to the affected area, causing redness and warmth. Increased permeability of blood vessels allows plasma proteins and white blood cells to move to the site of injury, resulting in swelling and pain. Neutrophils and macrophages help destroy microorganisms and remove dead cells. After the harmful stimulus is removed, the repair phase begins. Tissue repair may occur through regeneration, where normal cells replace damaged cells, or through fibrosis, where scar tissue forms. Inflammation is essential for healing, but excessive or prolonged inflammation may damage tissues and lead to chronic disease.

Describe the mechanisms and types of cell injury.
Cell injury occurs when cells are exposed to harmful stimuli such as toxins, infections, lack of oxygen, or physical trauma. The injury may be reversible or irreversible depending on the severity and duration of the damage. Reversible cell injury occurs when the damaging stimulus is mild or temporary. Cells may show swelling, accumulation of fat, and reduced function, but they can recover if the stimulus is removed. Irreversible cell injury leads to permanent damage and ultimately cell death. Major mechanisms responsible for cell injury include depletion of ATP, damage to cell membranes, mitochondrial dysfunction, accumulation of calcium inside the cell, and formation of free radicals. These changes disturb normal cellular metabolism and structural integrity. If the damage is severe, the cell undergoes necrosis or apoptosis, leading to loss of function of tissues or organs.

Define hypertrophy and hyperplasia. Explain their differences with examples.
Hypertrophy and hyperplasia are types of cellular adaptations that occur when cells respond to increased demand or stimulation. Hypertrophy refers to an increase in the size of individual cells, leading to enlargement of the affected tissue or organ. This occurs commonly in muscles, such as the enlargement of skeletal muscles due to exercise or cardiac muscle enlargement in hypertension. Hyperplasia, on the other hand, refers to an increase in the number of cells in a tissue or organ due to increased cell division. It commonly occurs in tissues capable of cell replication, such as the glandular epithelium of the breast during pregnancy. While hypertrophy involves enlargement of existing cells, hyperplasia involves formation of new cells. Both processes help the body adapt to increased functional demand but may lead to pathological conditions if excessive.

What is atrophy? Discuss its causes and effects on tissues.
Atrophy is the reduction in the size of cells, tissues, or organs due to a decrease in cell size or number. It usually occurs when there is reduced functional demand or inadequate nutrition to the tissue. Common causes of atrophy include disuse of muscles, loss of nerve supply, decreased blood supply, aging, malnutrition, and hormonal changes. For example, skeletal muscles become smaller and weaker when they are not used for long periods, such as during immobilization after fractures. During atrophy, cells reduce their metabolic activity and may break down cellular components to conserve energy. Although atrophy can be a normal physiological process in aging, severe or prolonged atrophy can impair the function of the affected organ. Understanding atrophy is important in pathology because it reflects how tissues adapt to unfavorable conditions.

Explain apoptosis and necrosis as forms of cell death.
Cell death occurs mainly through two processes: apoptosis and necrosis. Apoptosis is a programmed and controlled form of cell death that occurs naturally in the body to remove damaged or unnecessary cells. It plays an important role in development, immune regulation, and tissue maintenance. During apoptosis, cells shrink, DNA fragments, and the cell breaks into small membrane-bound fragments that are removed by phagocytic cells without causing inflammation. Necrosis, on the other hand, is an uncontrolled form of cell death caused by severe injury such as infection, toxins, or lack of oxygen. In necrosis, cells swell, membranes rupture, and cellular contents leak into surrounding tissues, causing inflammation. Necrosis often leads to tissue damage and loss of organ function. Understanding these processes helps in diagnosing many diseases.

What are circulatory disorders? Describe common types affecting tissues.
Circulatory disorders refer to conditions that affect the normal flow of blood through the vessels, leading to tissue damage or organ dysfunction. One common disorder is thrombosis, which involves the formation of a blood clot within a blood vessel, obstructing blood flow. Another condition is embolism, where a clot or other material travels through the bloodstream and blocks a vessel at a distant site. Ischemia occurs when tissues receive inadequate blood supply, often due to obstruction of arteries. Prolonged ischemia can lead to infarction, which is tissue death caused by lack of oxygen. Edema is another circulatory disturbance characterized by accumulation of excess fluid in tissues due to imbalance in fluid movement. These disorders can significantly affect organ function and are important causes of many cardiovascular and systemic diseases.

Describe the role of the immune system in body defense.
The immune system protects the body against infections and harmful substances. It consists of various cells, tissues, and organs that work together to identify and eliminate pathogens such as bacteria, viruses, and parasites. The immune defense is broadly divided into innate immunity and adaptive immunity. Innate immunity is the first line of defense and includes physical barriers like skin, mucous membranes, and immune cells such as neutrophils and macrophages that quickly attack invading organisms. Adaptive immunity is more specific and involves lymphocytes, including B cells and T cells. B cells produce antibodies that neutralize pathogens, while T cells destroy infected or abnormal cells. The immune system also has memory cells that allow the body to respond more rapidly to previously encountered pathogens. Proper immune function is essential for maintaining health and preventing disease.

Explain infection and its effects on the body.
Infection occurs when microorganisms such as bacteria, viruses, fungi, or parasites invade the body and multiply, causing disease. These microorganisms enter the body through various routes such as the respiratory tract, digestive system, skin wounds, or contaminated food and water. Once inside, they damage tissues either directly through toxins or indirectly by triggering immune responses. The body responds to infection through inflammation and activation of immune cells to destroy the invading organisms. Symptoms of infection may include fever, swelling, pain, and loss of function in affected tissues. If the infection spreads through the bloodstream, it may cause systemic illness affecting multiple organs. Proper hygiene, vaccination, and timely medical treatment help prevent and control infections, making them an important topic in medical and pathological studies.

What is cell adaptation? Describe its importance in maintaining tissue function.
Cell adaptation refers to the reversible changes in the size, number, or function of cells in response to environmental stress or increased demand. These adaptations allow cells to survive under altered conditions and maintain normal function. Common types of cellular adaptation include hypertrophy, hyperplasia, atrophy, and metaplasia. For example, muscle cells may enlarge in response to increased workload, while tissues may reduce in size when they are not used. These changes help the body adjust to physiological demands such as exercise, pregnancy, or aging. However, prolonged or excessive stress may exceed the cell's adaptive capacity, leading to cell injury and disease. Understanding cell adaptation is important in pathology because it explains how tissues respond to stress and how certain diseases develop.

EIGHT  MARKS  QUESTIONS

Explain Neoplasia and describe the differences between benign and malignant tumors.

Neoplasia refers to an abnormal and uncontrolled proliferation of cells that forms a mass of tissue called a tumor or neoplasm. The growth of these cells is excessive and uncoordinated with the normal tissues and continues even after the initial stimulus that caused the change has been removed. Neoplasms arise due to genetic mutations in the cells that affect normal cell growth and division. These mutations may be caused by environmental factors such as chemicals, radiation, viruses, or inherited genetic defects.

Neoplasms are broadly classified into benign and malignant tumors. Benign tumors are non-cancerous growths that remain localized and usually grow slowly. They are well differentiated, meaning that the tumor cells closely resemble the normal cells from which they originate. Benign tumors are usually encapsulated, which means they are surrounded by a fibrous capsule that prevents them from invading surrounding tissues. Because of this, they rarely spread to other parts of the body and are generally less harmful, although they can still cause problems by compressing nearby structures.

Malignant tumors, on the other hand, are cancerous growths that grow rapidly and aggressively. These tumors are poorly differentiated or undifferentiated, meaning their cells look very different from normal cells. Malignant tumors have the ability to invade surrounding tissues and destroy them. One of the most dangerous features of malignant tumors is metastasis, which is the spread of cancer cells from the original site to distant organs through the blood or lymphatic system.

Common examples include benign tumors like lipoma and malignant tumors such as carcinoma and sarcoma. Early detection and diagnosis of neoplasia are important for effective treatment and management.

Describe inflammation and explain its role in tissue repair.

Inflammation is a protective response of the body to injury, infection, or harmful stimuli such as bacteria, toxins, or physical damage. It is an important part of the body's defense mechanism and helps to eliminate the cause of injury, remove damaged cells, and initiate the healing process. Inflammation is a complex biological response involving blood vessels, immune cells, and chemical mediators.

The classical signs of inflammation are redness (rubor), heat (calor), swelling (tumor), pain (dolor), and loss of function. These changes occur mainly due to increased blood flow and increased permeability of blood vessels at the site of injury. When tissues are damaged, chemical mediators such as histamine, prostaglandins, and cytokines are released. These substances cause dilation of blood vessels and allow immune cells like neutrophils and macrophages to move from the bloodstream to the affected tissue.

Inflammation can be classified into acute inflammation and chronic inflammation. Acute inflammation is a short-term response that develops quickly and usually resolves once the harmful stimulus is removed. It is characterized by the accumulation of neutrophils at the site of injury. Chronic inflammation occurs when the inflammatory response persists for a long time, often due to persistent infection, autoimmune diseases, or prolonged exposure to harmful agents.

Inflammation also plays a crucial role in tissue repair and healing. During this process, damaged tissue is replaced by regeneration of normal cells or by the formation of scar tissue. Fibroblasts produce collagen, and new blood vessels form in a process called angiogenesis. This leads to the restoration of tissue structure and function. Thus, inflammation is essential for protection and healing, but excessive or prolonged inflammation can lead to tissue damage.

Explain cell injury and the different types of cellular adaptations.

Cell injury occurs when cells are exposed to harmful stimuli that disrupt their normal structure and function. These injurious factors may include physical agents such as heat, cold, radiation, or trauma; chemical agents such as toxins and drugs; biological agents such as bacteria and viruses; and lack of oxygen known as hypoxia. Depending on the severity and duration of the injury, the damage to the cell may be reversible or irreversible.

When the stress on the cell is mild or moderate, cells attempt to adapt in order to survive. These changes are known as cellular adaptations. Cellular adaptation allows cells to maintain normal function in response to environmental changes.

The major types of cellular adaptation include atrophy, hypertrophy, hyperplasia, and metaplasia. Atrophy refers to a decrease in the size and function of cells, tissues, or organs due to reduced workload, loss of blood supply, malnutrition, or aging. For example, muscle wasting in immobilized limbs is a form of atrophy.

Hypertrophy is the increase in the size of cells, which leads to enlargement of the affected organ. This usually occurs in tissues that cannot divide, such as cardiac muscle. An example is enlargement of the heart in patients with hypertension.

Hyperplasia refers to an increase in the number of cells in a tissue or organ due to increased cell division. This results in enlargement of the tissue and is often seen in glandular tissues or during hormonal stimulation.

Metaplasia is the reversible replacement of one mature cell type by another type that is better able to withstand stress. For instance, in smokers, the normal respiratory epithelium may change to a squamous epithelium.

These adaptive mechanisms help cells survive stress, but if the stress becomes severe or prolonged, it may lead to irreversible injury and cell death.

Describe the different types of circulatory disorders and their pathological significance.

Circulatory disorders are conditions that affect the normal flow of blood within the cardiovascular system. These disorders can lead to inadequate supply of oxygen and nutrients to tissues and may result in tissue damage or organ dysfunction. Circulatory disturbances are important topics in pathology because they are associated with many serious diseases.

One of the most common circulatory disorders is edema, which is the abnormal accumulation of fluid in the interstitial spaces or body cavities. Edema may occur due to increased hydrostatic pressure, decreased plasma protein levels, increased capillary permeability, or obstruction of lymphatic drainage.

Thrombosis is another important circulatory disorder and refers to the formation of a blood clot (thrombus) inside a blood vessel. This clot may partially or completely block the blood flow. Thrombosis commonly occurs in conditions such as atherosclerosis, prolonged immobilization, or damage to blood vessel walls.

Embolism occurs when a detached clot or other material such as fat or air travels through the bloodstream and lodges in a distant vessel, causing obstruction. Pulmonary embolism is a serious condition in which an embolus blocks the pulmonary artery in the lungs.

Infarction refers to tissue death caused by the loss of blood supply. It usually occurs due to blockage of an artery supplying an organ. A common example is myocardial infarction (heart attack), where blood supply to a part of the heart muscle is suddenly blocked.

Another important circulatory disorder is shock, which is a life-threatening condition characterized by severe circulatory failure leading to inadequate tissue perfusion.

Understanding these circulatory disturbances helps in early diagnosis and management of many clinical conditions.

Define atrophy, hypertrophy, hyperplasia and metaplasia and explain their pathological significance.

Cells constantly adjust to changes in their environment in order to maintain normal function. When exposed to stress or increased demand, cells may undergo structural and functional changes known as cellular adaptations. The main types of cellular adaptations include atrophy, hypertrophy, hyperplasia, and metaplasia.

Atrophy refers to a decrease in the size of cells, resulting in the reduction in the size of an organ or tissue. It occurs due to reduced workload, loss of nerve supply, decreased blood supply, malnutrition, aging, or hormonal changes. For example, muscle atrophy can occur when a limb is immobilized in a cast for a long period.

Hypertrophy is the increase in the size of cells, leading to enlargement of the organ. It commonly occurs in tissues that have limited ability to divide, such as cardiac muscle. A typical example is enlargement of the heart muscle in patients with high blood pressure due to increased workload.

Hyperplasia refers to an increase in the number of cells in a tissue or organ due to increased cell division. This results in enlargement of the affected organ. Hyperplasia often occurs in tissues capable of cell division, such as epithelial tissues and glands. An example is the enlargement of the breast during pregnancy due to hormonal stimulation.

Metaplasia is the reversible transformation of one type of mature cell into another type that is better able to tolerate environmental stress. A common example is the replacement of normal respiratory epithelium with squamous epithelium in smokers.

Although these adaptations help cells survive adverse conditions, persistent stress may lead to more severe damage, including dysplasia, neoplasia, or cell death. Therefore, understanding these adaptive changes is important in the study of disease processes.

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