Parathyroid hormone is released when blood calcium levels decrease. This is an example of control by ________ stimuli.

A) hormonal
B) neural
C) humoral
D) visceral

Parathyroid Hormone

A critical regulator of serum calcium and phosphate concentration, influencing bone health by promoting calcium release from bones and absorption from the intestine.

Blood Calcium

The level of calcium in the blood, essential for various physiological processes including bone formation, muscle contraction, and blood clotting.

Humoral

Related to body fluids, especially regarding the immune response mediated by antibodies in the bloodstream.