An increase in parathyroid hormone levels results in
A)increased rate of bone resorption.
B)increased rate of vitamin D degradation.
C)increased concentration of potassium ions in the urine.
D)increased rate of calcium ion excretion by the kidneys.
E)decreased levels of blood calcium.

Question

Quizplus · Accepted Answer

Parathyroid hormone increases the rate of bone resorption, which releases calcium ions into the bloodstream. This helps to increase blood calcium levels. It also increases the reabsorption of calcium ions in the kidneys, which decreases the excretion of calcium ions in the urine. Additionally, parathyroid hormone stimulates the production of active vitamin D, which helps to increase calcium absorption in the intestines. Therefore, an increase in parathyroid hormone levels leads to increased bone resorption, increased calcium reabsorption in the kidneys, and increased vitamin D production, all of which help to increase blood calcium levels.

An Increase in Parathyroid Hormone Levels Results in