Question

Fill in the blanks:
1. The (a)______ lymphoid organs provide the sites for interaction of lymphocytes with antigen, which then proliferate to become (b)__________
2. The thymus is a lobed organ located near the heart and beneath the (c)_________
3. Spleen has a large reservoir of (d)__________

• A. $a$—primary, $b$—antigen sensitive cells, $c$—collar bone, $d$—lymphocytes
• B. $a$—secondary, $b$—receptor cells, $c$—breastbone, $d$—erythrocytes
• C. $a$—primary, $b$—effector cells, $c$—breast bone, $d$— lymphocytes
• D. $a$—secondary, $b$—effector cells, $c$—breastbone, $d$— erythrocytes

Answer 1

Answer: (D)

1. The secondary lymphoid organs provide the sites for interaction o f lymphocytes with antigen, which then proliferate to become effector cells.
2. The thymus is a lobed organ located near the heart and beneath the breastbone/sternum.
3. Spleen has a large reservoir of erythrocytes/RBCs.