Question 1

Which type of white blood cells are primarily responsible for producing antibodies?

Accepted Answer

B-lymphocytes. B-lymphocytes differentiate into plasma cells to secrete specific antibodies. These antibodies neutralize pathogens like bacteria and viruses circulating in the blood. They are a core component of the adaptive immune system.

Question 2

What is the primary function of the 'Memory cells' in the immune system?

Accepted Answer

To remember previous infections. Memory cells persist in the body after an initial infection is cleared. They recognize the same pathogen quickly if it enters the body again. This ensures a faster and stronger secondary immune response.

Question 3

Which of the following is considered the 'First line of defense' in human immunity?

Accepted Answer

Skin and Mucous membranes. The skin provides a physical barrier that prevents most microbes from entering. Mucous membranes trap pathogens in the respiratory and digestive tracts. This non-specific barrier acts before any internal immune response begins.

Question 4

Which organ is often called the 'Graveyard' of red blood cells and acts as a major filter for the blood?

Accepted Answer

Spleen. The spleen filters out old red blood cells and recycles their components. It also contains high concentrations of white blood cells to detect blood-borne pathogens. This organ plays a vital role in both circulatory and immune functions.

Question 5

What type of immunity is gained when a person recovers from a disease like chickenpox?

Accepted Answer

Natural Active Immunity. Natural active immunity occurs when the body's own immune system produces antibodies in response to an actual infection. This usually provides long-term protection against the same disease. It is distinguished from immunity gained through vaccination.

Immunity — Set 1