Question

1. b and t cells spend most of their time in the _____.

a. bloodstream
b. lymphatic system
c. heart chambers
d. capillaries

Explanation:

B and T - cells are lymphocytes. The lymphatic system is the primary site where lymphocytes, including B and T - cells, mature, are stored, and circulate. While they can be found in the bloodstream and other related structures, they spend most of their time in the lymphatic system.

Answer:

B. Lymphatic system