Biology

Human Immunity and Blood

2,096 Questions

Human immunity and blood questions cover the physiological mechanisms protecting the body against diseases and the components of blood. Topics include blood groups, cell mediated immunity, monoclonal antibodies, and blood coagulation. These biology topics frequently appear in general science sections of competitive exams.

Blood groupsCell mediated immunityMonoclonal antibodiesBlood coagulationCancer immunology

Human Immunity and Blood Questions

Multiple choice

What is the ABO blood group system?

  1. A classification system based on the presence or absence of A and B antigens on red blood cells

  2. A classification system based on the presence or absence of Rh factor on red blood cells

  3. A classification system based on the presence or absence of both A and B antigens and Rh factor on red blood cells

  4. A classification system based on the presence or absence of plasma proteins
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A Correct answer
Explanation

The ABO blood group system classifies blood into four main groups: A, B, AB, and O, based on the presence or absence of A and B antigens on the surface of red blood cells.

Multiple choice

What is the Rh factor?

  1. A protein found on the surface of red blood cells

  2. A protein found in plasma

  3. A protein found in white blood cells

  4. A protein found in platelets
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A Correct answer
Explanation

The Rh factor is a protein found on the surface of red blood cells. Individuals who have the Rh factor are Rh-positive, while those who lack it are Rh-negative.

Multiple choice

What is the significance of blood type compatibility in blood transfusions?

  1. To prevent immune reactions and transfusion complications

  2. To ensure the proper functioning of transfused blood cells

  3. To maintain blood pressure levels

  4. To regulate blood clotting
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A Correct answer
Explanation

Blood type compatibility is crucial in blood transfusions to prevent immune reactions and transfusion complications. Incompatible blood transfusions can lead to hemolytic reactions, where transfused red blood cells are destroyed by the recipient's immune system.

Multiple choice

What is the role of cross-matching in blood transfusions?

  1. To determine the compatibility of donor and recipient blood

  2. To measure the volume of blood to be transfused

  3. To check for the presence of infections in the donor's blood

  4. To monitor the patient's vital signs during the transfusion
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A Correct answer
Explanation

Cross-matching is a laboratory procedure performed before a blood transfusion to ensure the compatibility of donor and recipient blood. It involves testing the recipient's serum against the donor's red blood cells to detect any potential immune reactions.

Multiple choice

What are the potential risks and complications associated with blood transfusions?

  1. Immune reactions, such as hemolytic transfusion reactions

  2. Transfusion-related infections

  3. Circulatory overload

  4. All of the above
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D Correct answer
Explanation

Blood transfusions carry potential risks and complications, including immune reactions (e.g., hemolytic transfusion reactions), transfusion-related infections (e.g., hepatitis, HIV), and circulatory overload (excessive fluid volume in the bloodstream).

Multiple choice

What are the criteria for selecting a suitable blood donor?

  1. Healthy individuals between the ages of 18 and 65

  2. Individuals with a history of blood transfusions

  3. Individuals with certain medical conditions, such as diabetes or heart disease

  4. Individuals who have recently taken certain medications
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A Correct answer
Explanation

Suitable blood donors are typically healthy individuals between the ages of 18 and 65 who meet specific health and lifestyle criteria, such as having a normal blood pressure, hemoglobin level, and no history of certain medical conditions or recent medication use that may affect the safety of the blood donation.

Multiple choice

What is the process of leukoreduction in blood transfusions?

  1. Removing white blood cells from donated blood

  2. Adding white blood cells to donated blood

  3. Separating red blood cells from plasma

  4. Mixing different blood types together
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A Correct answer
Explanation

Leukoreduction is the process of removing white blood cells from donated blood. This is done to reduce the risk of transfusion-related complications, such as febrile non-hemolytic transfusion reactions and transfusion-associated graft-versus-host disease.

Multiple choice

Which organ is responsible for producing red blood cells?

  1. Bone marrow

  2. Liver

  3. Kidneys

  4. Spleen
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A Correct answer
Explanation

Bone marrow is a soft tissue found inside bones that produces red blood cells, white blood cells, and platelets.

Multiple choice

What type of cancer affects the blood-forming tissues, including bone marrow and lymph nodes?

  1. Melanoma

  2. Lymphoma

  3. Sarcoma

  4. Leukemia
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D Correct answer
Explanation

Leukemia is a type of cancer that affects the blood-forming tissues, disrupting the production of healthy blood cells.

Multiple choice

Which cancer is associated with the uncontrolled growth of cells in the liver, the organ responsible for filtering toxins from the blood?

  1. Liver Cancer

  2. Pancreatic Cancer

  3. Gallbladder Cancer

  4. Stomach Cancer
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A Correct answer
Explanation

Liver cancer arises from the abnormal proliferation of cells in the liver, often leading to the formation of malignant tumors.

Multiple choice

Which of the following is a type of innate immune response?

  1. Adaptive immunity

  2. Humoral immunity

  3. Cell-mediated immunity

  4. Natural immunity
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D Correct answer
Explanation

Natural immunity is a type of innate immune response that is present from birth and does not require prior exposure to a pathogen.

Multiple choice

Which of the following is a chemical barrier of innate immunity?

  1. Lysozyme

  2. Interferon

  3. Complement system

  4. All of the above
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D Correct answer
Explanation

Lysozyme, interferon, and the complement system are all chemical barriers of innate immunity that help to kill or inactivate pathogens.

Multiple choice

Which of the following is a cellular component of innate immunity?

  1. Neutrophils

  2. Macrophages

  3. Natural killer cells

  4. All of the above
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D Correct answer
Explanation

Neutrophils, macrophages, and natural killer cells are all cellular components of innate immunity that help to kill or phagocytize pathogens.

Multiple choice

Which of the following is a type of pattern recognition receptor (PRR)?

  1. Toll-like receptors (TLRs)

  2. C-type lectin receptors (CLRs)

  3. NOD-like receptors (NLRs)

  4. All of the above
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D Correct answer
Explanation

Toll-like receptors (TLRs), C-type lectin receptors (CLRs), and NOD-like receptors (NLRs) are all types of pattern recognition receptors (PRRs) that help to recognize pathogens and trigger innate immune responses.

Multiple choice

Which of the following is a type of cytokine that is produced by innate immune cells?

  1. Interleukin-1 (IL-1)

  2. Interleukin-6 (IL-6)

  3. Tumor necrosis factor-alpha (TNF-alpha)

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Interleukin-1 (IL-1), interleukin-6 (IL-6), and tumor necrosis factor-alpha (TNF-alpha) are all types of cytokines that are produced by innate immune cells and help to regulate the immune response.