Question

which of the following statements about memory cells is true?
they are macrophages that store copies of antibodies for decades.
they make copies of t cells that remain active long after the primary response has ended.
they include b cells and t cells that remain in the body for long periods of time after the first exposure to a pathogen.
they become t cells during a secondary response to a pathogen.
question 34 1 pts
swelling and soreness of the lymph nodes indicate that
immune cells are fighting infection.
the immune system is incapable of working.
too much or improper exercise has been undertaken.
none of the above
dangerous cancerous changes are occurring in the immune system.

Explanation:

First Question (About Memory Cells)

• Analyze each option:
• Option 1: Memory cells are not macrophages; macrophages are different immune cells. Eliminate.
• Option 2: Memory T cells are dormant (not active) until re - exposed to the pathogen. Eliminate.
• Option 3: Memory B and T cells do remain in the body for long after the first exposure to a pathogen, ready to respond quickly on re - exposure. This is correct.
• Option 4: Memory cells don't become T cells during a secondary response; they differentiate into effector cells (like plasma cells for B memory cells or effector T cells for T memory cells). Eliminate.

• Analyze each option:
• Option 1: Lymph nodes swell and become sore because immune cells (like lymphocytes) are multiplying and fighting infection within them. This is correct.
• Option 2: Swelling shows the immune system is active, not incapable. Eliminate.
• Option 3: Swelling of lymph nodes is related to infection, not usually exercise. Eliminate.
• Option 4: Since Option 1 is correct, this is wrong. Eliminate.
• Option 5: Swelling due to infection is common, not necessarily cancerous. Eliminate.

Answer:

They include B cells and T cells that remain in the body for long periods of time after the first exposure to a pathogen.

Question 34 (Swelling and Soreness of Lymph Nodes)