Q. 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)__________

 1947  187 Human Health and Disease Report Error

Solution:

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.