Question 1

Which of the following best describes the role of negative feedback in hormone secretion?

Accepted Answer

It maintains homeostasis by reducing hormone secretion when levels are adequate.

Question 2

A patient presents with excessive thirst and high urine output. Laboratory tests reveal high plasma osmolality and low levels of antidiuretic hormone (ADH). What is the most likely diagnosis?

Accepted Answer

Diabetes Insipidus

Question 3

Which structure connects the hypothalamus to the anterior pituitary and allows for the transport of releasing and inhibiting hormones?

Accepted Answer

Hypothalamic-hypophyseal portal system

Question 4

What is the primary effect of antidiuretic hormone (ADH) on the kidneys?

Accepted Answer

Triggers insertion of aquaporins to increase water reabsorption

Question 5

Oxytocin is involved in which of the following physiological processes?

Accepted Answer

Milk ejection and uterine contractions

Question 6

Which hormone is released by the hypothalamus to stimulate the anterior pituitary to secrete thyroid-stimulating hormone (TSH)?

Accepted Answer

Thyrotropin-releasing hormone (TRH)

Question 7

A tumor causing hypersecretion of growth hormone (GH) before closure of the epiphyseal plates will most likely result in which condition?

Accepted Answer

Gigantism

Question 8

Which of the following is a direct effect of parathyroid hormone (PTH) on bone?

Accepted Answer

Stimulates osteoclasts to release calcium into the blood

Question 9

What is the main trigger for the release of calcitonin from the thyroid gland?

Accepted Answer

High blood calcium levels

Question 10

Which of the following equations correctly represents the conversion of T4 to T3 in peripheral tissues?

Accepted Answer

$$T_4$$ \rightarrow $$T_3$$

Question 11

A patient with hypothyroidism will have which of the following changes in hormone levels due to negative feedback?

Accepted Answer

Increased TRH and TSH

Question 12

Which hormone is responsible for increasing calcium absorption from the small intestine by activating vitamin D in the kidneys?

Accepted Answer

Parathyroid hormone (PTH)

Question 13

Which of the following best describes the effect of high levels of calcitonin on bone?

Accepted Answer

Inhibits osteoclasts and promotes net bone formation

Question 14

Which hormone is secreted by the anterior pituitary and stimulates the thyroid gland to produce T3 and T4?

Accepted Answer

Thyroid-stimulating hormone (TSH)

Question 15

Which of the following is a short-term effect of growth hormone (GH)?

Accepted Answer

Promotes fat breakdown and increases blood glucose

Question 16

What is the primary function of the hypothalamic-hypophyseal portal system?

Accepted Answer

Delivering releasing and inhibiting hormones from the hypothalamus to the anterior pituitary

Question 17

Which hormone is most likely to be elevated in a patient with hyperthyroidism?

Accepted Answer

T3 and T4

Question 18

Which of the following best explains the physiological response to low blood calcium levels?

Accepted Answer

Increased secretion of parathyroid hormone (PTH) to stimulate osteoclasts and activate vitamin D

Question 19

Which hormone is released in response to high plasma osmolality and acts to retain water in the body?

Accepted Answer

Antidiuretic hormone (ADH)

Question 20

Which of the following is a correct sequence in the negative feedback regulation of thyroid hormone production?

Accepted Answer

$$TRH \rightarrow TSH \rightarrow T_3$/T_4$

Chapter 16: The Endocrine System – Regulation, Hypothalamus, Pituitary, Thyroid, and Parathyroid Glands

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