Question

In: Anatomy and Physiology

If a pituitary adenoma secretes excessive amounts of prolactin, levels of which of the following hormones...

If a pituitary adenoma secretes excessive amounts of prolactin, levels of which of the following hormones will be elevated?

TRH

TSH

thyroid hormone

none of the above

Which of the following will occur if the thyroid is unable to secrete thyroid hormones?

excessive PRL secretion will make TRH levels abnormally low

excessive TRH secretion will stimulate PRL secretion

TSH will stimulate PRL secretion

PRL will stimulate TSH secretion

Which of the following hormones does not exert an inhibitory influence on the secretion of another hormone as part of a negative feedback mechanism?

PRL

TRH

thyroid hormone

Which of the following would be the best choice for treating a patient with a hyperprolactinemia that resulted from a non-functioning thyroid?

administration of a dopamine agonist

a TSH antagonist

TRH injuction

administration of thyroid hormones

Which of the following would be the best choice for treating a patient with a hypothyroidism caused by a PRL secreting adenoma?

TRH injection

administration of a dopamine agonist

administration of thyroid hormones

a TSH antagonist

The semilunar valves are open throughout which of the following stages?

isovolumic relaxation

isovolumic contraction

ejection

passive filling

The semilunar valves open at the end of which of the following stages?

isovolumic relaxation

passive filling

isovolumic contraction

ejection

All four valves are shut during which of the following stages?

isovolumic contraction

passive filling

ejection

active filling

All four chambers are relaxed during which of the following?

ejection

isovolumic contraction

passive filling

active filling

Solutions

Expert Solution

1) TRH (Thyrotropin releasing hormone)

The prolactinoma is caused due to the formation of benign tumor in the pituitary gland and hence it stimulates the increase production of milk due to the increase in secretion of prolactin. It is found that due to the formation of the pituitary adenoma, it leads to hypothyroidism which causes decrease in the production of thyroid hormones. When one is suffering from pituitary adenoma, it is found that it increases the release of the TRH or thyrotropin releasing hormone which is produced by hypothalamus. This hormone helps in increasing the release of thyrotropin as well as prolactin from the pituitary gland.

The second option is not correct because pituitary adenoma tends to cause hypothyroidism in which there is decrease in the production of the thyroid hormone. Due to the increase in the tumor size within the pituitary gland, it leads to decreased production of TSH or thyroid stimulating hormone.

The third option is not correct because pituitary adenoma leads to decrease production of thyroid hormone and this is because it is not able to produce enough thyroid stimulating hormone. Hence it is responsible for causing hypothyroidism.


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