Which hormone works antagonistically to parathormone?
Correct answer: D. Calcitonin
- A. Tri-idothyronine
- B. Insulin
- C. Estrogen
- D. Calcitonin
Explanation
Calcitonin is a hormone produced by the thyroid gland that helps regulate calcium levels in the blood by inhibiting bone breakdown and enhancing calcium excretion by the kidneys. It works antagonistically to parathormone by opposing its effects on calcium metabolism. While parathyroid hormone (parathormone) increases blood calcium levels by promoting bone resorption and calcium reabsorption in the kidneys, calcitonin decreases blood calcium levels by inhibiting bone resorption.
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About Coordination and Control
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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