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In the context of the hypothalamus-pituitary-adrenal (HPA) axis, what is the primary role of the hypothalamus?

A.

To increase blood glucose levels directly

B.

To store and release oxytocin

C.

To secrete corticotropin-releasing hormone (CRH)

D.

To produce aldosterone

Answer and Explanation

The Correct Answer is C

A. To increase blood glucose levels directly: The hypothalamus does not directly raise blood glucose; it regulates hormones that influence this process indirectly via other glands.
B. To store and release oxytocin: Oxytocin is stored and released by the posterior pituitary, not the hypothalamus itself.
C. To secrete corticotropin-releasing hormone (CRH): The hypothalamus produces and releases CRH, which stimulates the anterior pituitary to secrete ACTH, initiating the HPA axis cascade leading to cortisol release.
D. To produce aldosterone: Aldosterone is a mineralocorticoid hormone produced by the adrenal cortex, not by the hypothalamus.


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Related Questions

Correct Answer is A

Explanation

A. Hypothalamic-pituitary-adrenal axis:The HPA axis is the primary hormonal axis activated during stress, with CRH → ACTH → cortisol resulting in increased cortisol levels.
B. Hypothalamic-pituitary-gonadal axis:The HPG axis controls reproductive hormones and is not the primary axis for acute cortisol-mediated stress responses.
C. Renin-angiotensin-aldosterone system:The RAAS helps regulate blood pressure and volume (aldosterone) and can be activated in some stressors but is not the main system for raising cortisol.
D. Sympathetic nervous system:The sympathetic nervous system mediates the fast "fight-or-flight" response (epinephrine/norepinephrine) but the slower hormonal increase in cortisol is primarily via the HPA axis.

Correct Answer is A

Explanation

A. The endocrine system uses hormones for signaling, while the nervous system uses neurotransmitters.: The endocrine system releases chemical messengers (hormones) into the bloodstream that act on distant targets, while the nervous system transmits signals using neurons that release neurotransmitters at synapses for rapid, localized communication.
B. The endocrine system uses electrical signals, while the nervous system uses chemical signals.: The endocrine system relies on chemical hormones rather than electrical impulses; electrical signals are a primary feature of neuronal (nervous) communication.
C. The nervous system generates responses that take longer to occur compared to the endocrine system.: Nervous-system responses are typically rapid and short-lived because of fast electrical conduction and synaptic transmission, whereas endocrine responses are usually slower to start but longer-lasting.
D. Both systems use hormones for signaling but at different speeds.: While the endocrine system primarily uses hormones, the nervous system mainly uses electrical impulses and neurotransmitters; hormones can modulate neural function but the two systems do not both primarily use hormones.

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