Which of the following describes the negative feedback mechanism in hormone regulation?
An increase in hormone levels leads to an increase in secretion of that hormone.
Hormone levels remain constant regardless of bodily needs.
Hormone secretion is regulated by conscious thought.
A decrease in hormone levels triggers an increase in secretion of that hormone.
The Correct Answer is D
A. An increase in hormone levels leads to an increase in secretion of that hormone.: This describes positive feedback rather than negative feedback.
B. Hormone levels remain constant regardless of bodily needs.: Hormone secretion changes in response to physiological needs; negative feedback maintains homeostasis rather than absolute constancy.
C. Hormone secretion is regulated by conscious thought.: Hormone secretion is largely autonomic and homeostatic, not under conscious voluntary control.
D. A decrease in hormone levels triggers an increase in secretion of that hormone.: Negative feedback works by sensing low levels of a hormone (or its effect) and increasing secretion to restore balance.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Oxytocin:Oxytocin is synthesized in the hypothalamus and released from the posterior pituitary, not the anterior pituitary.
B. Antidiuretic hormone (ADH):ADH (vasopressin) is produced in the hypothalamus and released from the posterior pituitary, so it is not secreted by the anterior pituitary.
C. Cortisol:Cortisol is produced by the adrenal cortex in response to ACTH from the anterior pituitary; the anterior pituitary does not secrete cortisol itself.
D. Growth hormone (GH):Growth hormone is synthesized and secreted by the anterior pituitary and acts on many tissues to promote growth and metabolism.
Correct Answer is D
Explanation
A. The hypothalamus is posterior to the pituitary gland:The hypothalamus is actually superior (above) and connected to the pituitary; it is not located posterior to the pituitary.
B. The hypothalamus is located within the sella turcica:The sella turcica is the bony depression in the sphenoid bone that houses the pituitary gland, not the hypothalamus, which lies superior to it in the diencephalon.
C. The pituitary gland is superior to the hypothalamus:The pituitary lies inferior to the hypothalamus; it is not superior.
D. The pituitary gland is connected to the hypothalamus by the infundibulum:The infundibulum (pituitary stalk) physically connects the hypothalamus to the pituitary, allowing neural and vascular communication between them.
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