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When the ovaries secrete estrogen in response to the hormone GnRH, this is an example of

A.

Hormonal

B.

Neural

C.

Negative Feedback

D.

Humoral

Answer and Explanation

The Correct Answer is A

a) Hormonal: This refers to the stimulation of one endocrine gland by hormones released from another gland. GnRH from the hypothalamus stimulates the anterior pituitary to release LH/FSH, which then stimulate the ovaries to secrete estrogen. Thus, this is hormonal control.

b) Neural: Neural stimulation involves direct innervation (e.g., adrenal medulla stimulated by the sympathetic nervous system), which does not apply here.

c) Negative Feedback: This refers to a regulatory mechanism, not the initial cause of estrogen secretion. Estrogen can negatively feedback on GnRH, but that’s not the mechanism being asked.

d) Humoral: Humoral stimuli refer to changes in blood levels of ions or nutrients (e.g., calcium regulating PTH), not hormones.


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Related Questions

Correct Answer is C

Explanation

a) Hepatic portal system: This carries blood from the gastrointestinal tract to the liver, not the brain.

b) Coronary circulatory system: This system supplies the heart muscle, not involved in hormone transport from hypothalamus.

c) hypophyseal portal system: The hypophyseal portal system is a specialized vascular system that transports releasing and inhibiting hormones from the hypothalamus to the anterior pituitary.

d) Hypothalamus-hypophysial tract: This is a neural pathway used to transport ADH and oxytocin to the posterior pituitary, not the anterior.

Correct Answer is A

Explanation

a) Glucocorticoids: The zona fasciculata is the middle layer of the adrenal cortex. It primarily secretes glucocorticoids, mainly cortisol, which helps regulate metabolism, immune response, and stress adaptation.

b) Mineralocorticoids: Mineralocorticoids like aldosterone are produced in the zona glomerulosa, the outermost layer of the adrenal cortex.

c) Catecholamines: Catecholamines (e.g., epinephrine and norepinephrine) are produced in the adrenal medulla, not the cortex.

d) Androgens: Androgens (e.g., DHEA) are produced in the zona reticularis, the innermost layer of the adrenal cortex.

e) Epinephrine: Epinephrine is a catecholamine produced in the adrenal medulla. It is not produced in any zone of the adrenal cortex, including the zona fasciculata.

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