Calcium is released from bone into the bloodstream due to the action of:
Correct answer: D. PTH
- A. ADH
- B. GnRH
- C. LH
- D. PTH
Explanation
Parathyroid hormone (PTH) stimulates the release of calcium from bones into the bloodstream to maintain normal calcium levels. PTH acts on osteoclasts, promoting bone resorption, which releases calcium and phosphate into the blood. This process helps regulate serum calcium concentrations, ensuring proper functioning of nerves, muscles, and other physiological processes. Additionally, PTH enhances renal reabsorption of calcium and activates vitamin D, further aiding in calcium homeostasis.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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