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16 Questions

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PHY L2C HIPO PIT AXIS

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Questions and Answers

What is the role of oxytocin in response to the dilation of the cervix?

It causes further dilation of the cervix

It reduces the number of hormone receptors

It inhibits uterine contraction

It stimulates uterine contraction (correct)

How does the number of receptors for a hormone affect the maximal response?

Decrease in the number of receptors leads to an increase in maximal response

Increase in the number of receptors leads to a decrease in maximal response

Increase in the number of receptors leads to an increase in maximal response (correct)

No effect on the maximal response

What does sensitivity refer to in the context of hormonal response?

The affinity of the hormone for its receptor

The concentration of hormone required to produce maximal response

The number of receptors in a target tissue

The responsiveness of a target tissue to a hormone (correct)

How does increasing hormone concentration affect the doseresponse relationship?

It usually increases the response and then levels off Signup and view all the answers

Where are the cell bodies of hypothalamic neurons located?

In the median eminence of the hypothalamus Signup and view all the answers

How are hypothalamic-releasing hormones transported to the anterior pituitary?

Through hypothalamichypophysial portal blood vessels Signup and view all the answers

Where do the hormones secreted by the posterior pituitary enter after release from the nerve terminals?

Fenestrated capillaries Signup and view all the answers

Which organ is NOT a target tissue for oxytocin?

Pancreas Signup and view all the answers

What is the term for a decrease in the number or affinity of receptors for a hormone?

Down-regulation Signup and view all the answers

Which family of membrane-bound proteins couples hormone receptors to effector enzymes?

G proteins Signup and view all the answers

What is the major hormone concerned with the regulation of body fluid osmolarity?

Antidiuretic hormone (ADH) Signup and view all the answers

What does an increase in water permeability of principal cells in the late distal tubule and collecting duct via V2 receptors result in?

Increased water reabsorption Signup and view all the answers

What is the primary function of negative feedback in hormone regulation?

To inhibit further secretion of the hormone Signup and view all the answers

Where is oxytocin synthesized in the hypothalamus?

Paraventricular nuclei Signup and view all the answers

Which neural mechanism causes secretion of catecholamines from the adrenal medulla?

Preganglionic sympathetic nerves Signup and view all the answers

What is the effect of estrogen on the secretion of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) by the anterior pituitary?

Stimulates their secretion Signup and view all the answers