pituitary gland Flashcards

1
Q

mention the function of hypothalamus

A

synthesis of posterior pituitary hormones
control of anterior pituitary h secretions by s releasing&inhibitory h

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2
Q

what is the function of intermediate lobe of pituitary gland

A

the intermediate lobe has a role in animal .it secretes MSH . in human it is rudimentary

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3
Q

Supraoptic nuclei produce …………..&paraventricular n produce……………..

A

1.ADH
2.Oxitocin

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4
Q

Regulation of adenohypophysis function through………………………………

………………………………………

A

1- Hypothalamic control:
※ The anterior pituitary hormones are under control of the hypothalamus through releasing & inhibitory factors which are called “hypophysiotropic factors”
2- Feedback regulation

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5
Q

what r the types of feed-back control According to the distance between the site of hormone secrtion & site of feed-back effect

A

1- Ultra short loop feed-back:
↑ Hormone secreted from hypothalamus → (—) of hypothalamus.
2- Short loop feed-back:
↑ Hormone secreted from anterior Pituitary → (—) of hypothalamus.
3- Long loop feed-back:
↑ Hormone secreted from a peripheral endocrine gland → (—) of pituitary & hypothalamus.

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6
Q

give examples of
negative &positive feedback

A

1- -ve feed-back: the most common type
e.g. ↑ thyroid hormones → ↓ pituitary TSH → ↓ thyroid hormones
2- +ve feed-back: less common
e.g. ↑ estrogen → ↑ pituitary LH → further ↑ in estrogen.

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7
Q

Control of the hormone secretion is done through 1…………………
2………………………
3………………..

A

1- Feedback regulation:
A mechanism by which the endocrine system maintains constant level of any hormone in blood to maintain its optimum effect
2-neuroendocrine reflux
3- circadian rhythm

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