Blood calcium is lowered by the hormone:
Correct answer: A. Calcitonin
- A. Calcitonin
- B. Glucagon
- C. Adrenalin
- D. Thyroxine
Explanation
Calcitonin lowers blood calcium levels by inhibiting bone resorption. It acts on osteoclasts, reducing their activity and decreasing the release of calcium from bones into the bloodstream. Additionally, calcitonin promotes calcium excretion by the kidneys, further aiding in lowering blood calcium levels. This hormone helps regulate calcium homeostasis, counteracting the effects of parathyroid hormone (PTH) to maintain proper calcium balance in the body.
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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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