What role does the hypothalamus play in the endocrine system?
It regulates the release of hormones from the pituitary gland.
It secretes thyroid hormones directly into the bloodstream.
It stores hormones produced by the adrenal glands.
It produces insulin for glucose regulation.
The Correct Answer is A
A. It regulates the release of hormones from the pituitary gland: The hypothalamus produces releasing and inhibiting hormones and sends neural signals that control both anterior and posterior pituitary hormone secretion.
B. It secretes thyroid hormones directly into the bloodstream: Thyroid hormones are produced and secreted by the thyroid gland, not the hypothalamus.
C. It stores hormones produced by the adrenal glands: The hypothalamus does not store adrenal hormones; the adrenal glands synthesize and release their own hormones.
D. It produces insulin for glucose regulation: Insulin is produced by pancreatic beta cells in the islets of Langerhans, not by the hypothalamus.
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Related Questions
Correct Answer is D
Explanation
A. It directly releases cortisol into the bloodstream.:The hypothalamus does not release cortisol; cortisol is secreted by the adrenal cortex under pituitary control.
B. It secretes antidiuretic hormone (ADH) to control fluid balance.:ADH is synthesized in the hypothalamus but is stored and released from the posterior pituitary; secretion of ADH is one hypothalamic function but not the primary role in the HPA axis.
C. It inhibits the release of aldosterone from the adrenal cortex.:Aldosterone regulation is mainly via the renin–angiotensin system and potassium levels; the hypothalamus does not primarily inhibit aldosterone.
D. It secretes corticotropin-releasing hormone (CRH) to stimulate ACTH release.:The hypothalamus releases CRH, which stimulates the anterior pituitary to secrete ACTH, initiating the HPA axis cascade that leads to cortisol production.
Correct Answer is D
Explanation
A. Lymphocytes:Lymphocytes (B and T cells) typically increase in viral infections and chronic immune responses rather than in acute bacterial infections.
B. Eosinophils:Eosinophils increase primarily in parasitic infections and allergic reactions, not characteristically in acute bacterial infections.
C. Basophils:Basophils are involved in allergic and certain inflammatory responses and do not usually show a marked increase during acute bacterial infections.
D. Neutrophils:Neutrophils are first-line phagocytic responders and commonly increase (neutrophilia) in acute bacterial infections to help ingest and destroy bacteria.
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