How does the nervous system influence endocrine responses via the hypothalamus?
By altering the pH of the blood.
By increasing blood flow to endocrine organs.
By releasing hormones that regulate the pituitary gland.
By directly stimulating adrenal cortex hormone release.
The Correct Answer is C
A. By altering the pH of the blood.: The nervous system does not regulate endocrine responses by changing blood pH as a primary mechanism.
B. By increasing blood flow to endocrine organs.: While blood flow can influence hormone delivery, direct neural control of endocrine responses is primarily mediated via hypothalamic signaling rather than blood-flow changes.
C. By releasing hormones that regulate the pituitary gland.: The hypothalamus (a neural structure) secretes releasing and inhibiting hormones that regulate anterior pituitary secretion and sends neural signals to the posterior pituitary.
D. By directly stimulating adrenal cortex hormone release.: Direct neural stimulation primarily affects the adrenal medulla (catecholamine release); adrenal cortex activation is mostly hormonal via ACTH from the pituitary.
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Related Questions
Correct Answer is D
Explanation
A. Through conscious voluntary control:Pituitary secretions are regulated by neuroendocrine pathways and feedback loops, not by conscious voluntary control.
B. By the autonomic nervous system directly stimulating the pituitary gland:The autonomic nervous system can modulate some endocrine organs, but pituitary control is primarily via hypothalamic neural and vascular signals rather than direct autonomic stimulation of the pituitary itself.
C. By feedback from peripheral organs only:Peripheral hormone feedback influences both hypothalamus and pituitary, but this is not the sole mechanism—neural input from the hypothalamus is essential.
D. Through direct neural connections with the hypothalamus:The hypothalamus, a neural structure, communicates with the pituitary via neural (posterior pituitary axons) and vascular (hypophyseal portal) connections to regulate pituitary hormone release.
Correct Answer is A
Explanation
A. Parathyroid gland:The parathyroid glands secrete parathyroid hormone (PTH), the principal hormone that raises blood calcium by increasing bone resorption, renal calcium reabsorption, and activation of vitamin D.
B. Thyroid gland:The thyroid gland primarily regulates metabolism (thyroid hormones) and secretes calcitonin, which lowers blood calcium but plays a lesser role than PTH in everyday calcium regulation.
C. Pituitary gland:The pituitary regulates many endocrine glands via trophic hormones but does not directly control minute-to-minute calcium regulation.
D. Adrenal gland:The adrenal glands regulate stress responses, salt balance (aldosterone), and metabolism (cortisol), but not primary calcium homeostasis.
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