Hormonal Feedback Mechanisms MCQs

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What is the classification for glands that lack ducts and release their secretions directly into the bloodstream?

In the context of biological coordination, what is the primary output or target of the nervous system's regulatory signals?

Which hormone is primarily responsible for the development of male secondary sexual characteristics?

Which physiological mechanism allows the body to return to homeostasis following a stressful stimulus?

In the context of physiological homeostasis, what does the term 'negative feedback' describe?

How does the hypothalamus respond when osmoreceptors detect an increase in plasma osmotic pressure?

Synthesis and release of most hormones is regulated by negative feedback. Negative feedback means:

A The effect of hormones on target cells does not control further release of hormone. B Neural stimuli result in the release of oxytocin and antidiuretic hormone from the hypothalamus. C A rise in hormone levels affects the target organ which acts to inhibit further hormone release. D A rise in hormone levels affects the target organ which acts to stimulate further hormone release.

Which of the following physiological processes serves as an example of a negative feedback mechanism?

A As blood sugar level rises, insulin is released which promotes the absorp-tion of glucose from the blood by liver, muscle and fat cells. B The release by platelets that aggregate at the site of a blood vessel injury, of compounds that promote platelet aggregation. C As resting membrane potential rises, voltage-gated ion channels open which allow ions to enter the axon which causes further rise in the membrane potential and more ion channels to open. D The uterine contractions during childbirth push the baby’s head against the cervix which stimulates the uterus to contract.

Which of the following structures are classified as effectors within the context of chemical coordination in the human body?

Which hormone is primarily responsible for preparing the endometrium to facilitate the implantation of a zygote?

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