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

Hormonal

Neural

Negative Feedback

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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Correct Answer is A

Explanation

Colloid is a gel-like substance found within the follicles of the thyroid gland. It plays a critical role in the synthesis and storage of thyroid hormones.

A. increasing blood glucose levels B. the light and dark cycles C. the dysregulation of the immune system D. increasing pigmentation of the skin

Correct Answer is B

Explanation

a) Increasing blood glucose levels :Melatonin is not directly regulated by glucose.

b) The light and dark cycles: Melatonin secretion by the pineal gland is regulated by the suprachiasmatic nucleus in response to light exposure. Darkness stimulates its release, promoting sleep.

c) The dysregulation of the immune system :While melatonin has immune-modulating roles, this is not its main regulatory mechanism.

d) Increasing pigmentation of the skin :Melanin and melatonin are different substances.

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

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Naxlex Comprehensive Predictor Exams

In the diagram of the thyroid gland, Which letter indicates the follicles with colloids?

Correct Answer is A

Explanation

What stimulates melatonin production?

Correct Answer is B

Explanation

Match the following:

Which of the following is an indirect effect of PTH?

Match the cells in the diagram to their respective functions.

Which of the following statements is the first step in the synthesis and secretion of T3 and T4?

Place the following hormones in the correct order of their control, from first tier to third tier.

Steroid hormones exert their action by.

What stimulates the kidney to release erythropoietin EPO?

A patient came to the ER in hypovolemic shock due to massive blood loss. A blood transfusion is urgently needed. The image below shows agglutination test results using Anti-A, Anti-B, and Anti-D serums. Based on these results, what is the patient's blood type?