Parathyroid hormone causes a. the kidneys to excrete more...

Parathyroid hormone causes

a. the kidneys to excrete more calcium ions.
b. bone tissue to break down and release calcium into the
bloodstream.
c. fewer calcium ions to be absorbed by the intestines.
d. more calcium ions to be deposited in bone tissue.

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Key Concepts

Calcium Homeostasis

Calcium homeostasis refers to the processes by which the body regulates blood calcium levels. This balance is achieved through coordinated actions involving the bones, kidneys, intestines, and hormones, ensuring that calcium is available for critical functions such as muscle contraction, nerve transmission, and blood clotting.

Parathyroid Hormone (PTH)

Parathyroid hormone is secreted by the parathyroid glands in response to low blood calcium levels. It plays a vital role in increasing calcium levels by stimulating the release of calcium from bones, promoting calcium reabsorption in the kidneys, and indirectly enhancing calcium absorption in the intestines through the activation of vitamin D.

Bone Resorption

Bone resorption is the process by which bone tissue is broken down by osteoclasts to release minerals, including calcium, into the bloodstream. This mechanism is essential for maintaining adequate blood calcium levels, particularly when dietary intake is insufficient.

Renal Calcium Regulation

Renal calcium regulation involves the kidneys’ ability to adjust the amount of calcium excreted or reabsorbed. Under the influence of parathyroid hormone, the kidneys reabsorb more calcium, reducing its loss in urine and thereby contributing to the maintenance of stable blood calcium levels.

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