In humans, separation of the cells at the two-cell state following fertilization may lead to the production of twins, which in this case would be ________.

If the thyroid and parathyroid glands are surgically removed, which of the following would go out of balance without replacement therapy?

Which hormone decreases plasma calcium levels?

The osmotic pressures in the cortex and medulla of the kidney are _____ and _____, respectively.

The respiratory mechanism of acid-base balance:

Which is the peritubular capillaries?

The urinary bladder is composed of ________ epithelium.

The regulation of potassium balance:

________ determine(s) which antigens our adaptive immune system will be able to recognize and resist.

The distal portion of the small intestine contains clumps of lymph nodules called: