Answer:
C. Posterior pituitary is not involved in blood calcium homeostasis.
Step-by-step explanation:
Blood calcium homeostasis is the maintenance of a stable level of calcium in the blood, which is important for many physiological processes in the body.
The bones are the main storage site for calcium in the body and release calcium into the blood when needed.
The thyroid gland secretes calcitonin, which lowers blood calcium levels by inhibiting bone resorption and promoting calcium deposition in bones.
The kidneys help to regulate blood calcium levels by reabsorbing or excreting calcium as needed.
The parathyroid glands produce parathyroid hormone (PTH), which raises blood calcium levels by stimulating bone resorption, increasing calcium reabsorption in the kidneys, and promoting the activation of vitamin D, which enhances calcium absorption in the intestines.
The posterior pituitary gland does not play a role in regulating blood calcium levels. It secretes hormones such as oxytocin and antidiuretic hormone, which regulate water balance and reproductive functions, but have no effect on blood calcium levels.