Immune System Quiz

1. What type of white blood cell produces antibodies?

1. B cells
2. Natural killer cells
3. Neutrophils
4. T cells

2. What is the largest organ of the immune system?

1. Bone marrow
2. Lymph nodes
3. Spleen
4. Thymus

3. Which vitamin is well-known for supporting immune function and is found in citrus fruits?

1. Vitamin A
2. Vitamin B12
3. Vitamin C
4. Vitamin D

4. What term describes the immune system's ability to remember a pathogen and respond faster on re-exposure?

1. Herd immunity
2. Immunological memory
3. Innate immunity
4. Passive immunity

5. What are antibodies also called?

1. Antigens
2. Cytokines
3. Immunoglobulins
4. Lymphocytes

6. Which gland in the chest is responsible for maturing T cells?

1. Adrenal gland
2. Pancreas
3. Thymus
4. Thyroid

7. What is the 'first line of defence' in the immune system?

1. Antibodies
2. Physical barriers like skin and mucous membranes
3. T cells
4. The lymphatic system

8. An allergic reaction is caused by the immune system overreacting to a harmless substance. Which antibody is primarily involved?

1. IgA
2. IgE
3. IgG
4. IgM

9. What does a vaccine do to stimulate immunity?

1. Directly provides antibodies to fight infection
2. Introduces an antigen to trigger an immune response without causing full disease
3. Introduces live pathogens to infect the body
4. Suppresses the immune system temporarily

10. Chronic stress has what effect on the immune system?

1. It causes the immune system to attack healthy tissue
2. It has no effect on immunity
3. It strengthens immune responses
4. It suppresses immune function

11. What is an autoimmune disease?

1. A disease caused by a very strong immune system
2. A disease you can only get once
3. An allergy to one's own skin
4. When the immune system attacks the body's own healthy cells

12. Which of the following best supports a healthy immune system?

1. Avoiding all outdoor exposure
2. Regular exercise, good sleep, and a balanced diet
3. Sleeping 4 hours a night
4. Taking antibiotics preventively

13. What is 'herd immunity'?

1. Immunity that only works in groups
2. When all members of a community are vaccinated at the same time
3. When animals develop immunity before humans
4. When enough of a population is immune that a disease can no longer spread easily

14. What is the role of lymph nodes in the immune system?

1. Filtering lymph fluid and housing immune cells that detect pathogens
2. Producing red blood cells
3. Producing the hormone cortisol
4. Storing vitamin C for immune use

15. Gut health is linked to immunity. Approximately what percentage of the immune system is in the gut?

1. 20%
2. 40%
3. 70%
4. 90%

16. Which mineral, often found in nuts and seeds, plays an important role in immune function and wound healing?

1. Calcium
2. Iron
3. Magnesium
4. Zinc

17. What are cytokines?

1. A type of white blood cell
2. Antibodies targeting viruses
3. Chemical messengers that coordinate immune responses
4. Enzymes that break down bacteria

18. Why is breastfeeding beneficial for infant immune health?

1. It activates the baby's thymus gland faster
2. It contains stem cells that grow into T cells
3. It permanently prevents all childhood illness
4. It transfers the mother's antibodies (especially IgA) to the baby

19. What happens during inflammation, a key part of immune response?

1. Blood flow decreases to the affected area
2. Blood flow increases, immune cells rush to the site, causing redness, heat, and swelling
3. Immune cells are isolated away from infection
4. The body lowers its temperature to slow bacterial growth

20. Which of the following weakens the immune system over time?

1. A Mediterranean diet
2. Adequate sleep of 7–9 hours
3. Excessive alcohol consumption
4. Regular moderate exercise