Which of the following terms describes infrequent or difficult passing of stools?

Humoral and cell-mediated immunity differ in that cell-mediated immunity uses:

A) B cells, which generate effector cells to combat such invaders as intracellular organisms, while cellular immunity uses T cells that reside in lymph tissue and produce antibodies to combat foreign invaders. B) T cells, which generate effector cells to combat such invaders as intracellular organisms, while humoral immunity uses B cells that reside in lymph tissue and produce antibodies to combat foreign invaders. C) B cells, which generate effector cells to combat such invaders as intracellular organisms, while humoral immunity uses T cells that reside in lymph tissue and produce antibodies to combat foreign invaders. D) T cells, which reside in lymph tissue and produce antibodies to combat foreign invaders, while humoral immunity uses B cells that generate effector cells to combat such invaders as intracellular organisms.

What is the limiting factor for H+ excretion in the renal tubules?

a. Excessive amounts of Cl– b. Excessive amounts of HCO3– c. Insufficient buffers d. Insufficient sodium