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Calcitonin and parathyroid hormone (PTH):

A.

crease blood levels of calcium

B.

Are both secreted by the parathyroid gland

C.

Decrease blood levels of calcium

D.

Control blood levels of calcium

Answer and Explanation

The Correct Answer is D

A. Increase blood calcium: PTH increases it; calcitonin decreases it.

B. Both secreted by parathyroid gland: PTH is from parathyroid, calcitonin from thyroid.

C. Decrease blood calcium: Only calcitonin does; PTH increases calcium.

D. Control blood levels of calcium: Together they regulate calcium homeostasis.


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Related Questions

Correct Answer is A

Explanation

A. Estrogen: Promotes secondary sex characteristics and egg maturation.

B. Androgen: Male sex hormones like testosterone.

C. ICSH: Stimulates testosterone in males; not female-specific.

D. hCG: Maintains corpus luteum in pregnancy; doesn't initiate egg development.

Correct Answer is A

Explanation

A. Norepinephrine: Norepinephrine is secreted by the adrenal medulla and plays a key role in the fight-or-flight response.
B. ACh: Acetylcholine (ACh) is a neurotransmitter but is not secreted by the adrenal glands.
C. ACTH: Adrenocorticotropic hormone is secreted by the pituitary, not the adrenal gland.
D. ADH: Antidiuretic hormone is secreted by the posterior pituitary and regulates water balance.


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