Q: Which of the following equations correctly represents the process of gluconeogenesis promoted by cortisol?

$$\text{Noncarbohydrate substrates} \rightarrow \text{Glucose}$$

Q: Which of the following is a correct formula for the negative feedback regulation of thyroid hormone?

$$\text{High levels of T_3$ and T_4$} \rightarrow \text{Inhibit TRH and TSH release}$$

Question 1

Which of the following best describes the main difference between the nervous system and the endocrine system in terms of response duration and mechanism?

Accepted Answer

The nervous system initiates responses rapidly and acts via neurotransmitters at specific locations, while the endocrine system initiates responses slowly and acts via hormones released into the blood.

Question 2

Which function is NOT primarily regulated by the endocrine system?

Accepted Answer

Voluntary muscle contraction for movement

Question 3

A patient presents with symptoms of excessive urination (polyuria), excessive thirst (polydipsia), and dehydration. Laboratory tests reveal low levels of antidiuretic hormone (ADH). Which condition is most likely?

Accepted Answer

Diabetes Insipidus

Question 4

Which hormone is released in response to declining blood calcium levels and acts to increase blood calcium by stimulating osteoclast activity?

Accepted Answer

Parathyroid hormone (PTH)

Question 5

Which of the following is a water-soluble hormone that acts via G protein second messengers and cannot enter the cell?

Accepted Answer

Peptide hormone

Question 6

A patient with an anterior pituitary tumor is found to have abnormally high levels of growth hormone (GH). Which condition is most likely to develop in an adult?

Accepted Answer

Acromegaly

Question 7

Which of the following best explains the concept of 'permissiveness' in hormone interactions?

Accepted Answer

One hormone cannot exert its effects without another hormone being present.

Question 8

Which hormone is primarily responsible for stimulating the adrenal cortex to release corticosteroids?

Accepted Answer

Adrenocorticotropic hormone (ACTH)

Question 9

Which of the following is a direct effect of insulin on target cells?

Accepted Answer

Enhances membrane transport of glucose into cells

Question 10

A patient with hyperthyroidism is likely to present with which of the following symptoms?

Accepted Answer

Sensitivity to heat, weight loss, and high basal metabolic rate

Question 11

Which hormone is released by the posterior pituitary and is involved in uterine contraction and milk ejection?

Accepted Answer

Oxytocin

Question 12

Which of the following equations correctly represents the process of gluconeogenesis promoted by cortisol?

Accepted Answer

$$	ext{Noncarbohydrate substrates} ightarrow 	ext{Glucose}$$

Question 13

Which hormone is secreted in response to high blood glucose levels and acts to lower blood glucose?

Accepted Answer

Insulin

Question 14

Which of the following is a major effect of aldosterone?

Accepted Answer

Increases sodium reabsorption in the kidneys

Question 15

Which hormone is produced by parafollicular (C) cells of the thyroid and acts as an antagonist to parathyroid hormone?

Accepted Answer

Calcitonin

Question 16

A patient with Addison's disease is likely to have which of the following laboratory findings?

Accepted Answer

Low plasma glucose and sodium

Question 17

Which of the following best describes the role of the hypothalamus in endocrine regulation?

Accepted Answer

It secretes regulatory hormones that control the release of anterior pituitary hormones.

Question 18

Which of the following is a correct formula for the negative feedback regulation of thyroid hormone?

Accepted Answer

$$	ext{High levels of T_3$ and T_4$} ightarrow 	ext{Inhibit TRH and TSH release}$$

Question 19

Which hormone is responsible for the 'fight or flight' response, increasing heart rate and blood glucose levels during acute stress?

Accepted Answer

Epinephrine

Question 20

Which of the following is a correct multi-step pathway for the release of thyroid hormone?

Accepted Answer

$$	ext{Hypothalamus} \xrightarrow{TRH} 	ext{Anterior Pituitary} \xrightarrow{TSH} 	ext{Thyroid Gland} \xrightarrow{T_3$, T_4$}$$

The Endocrine System: Structure, Function, and Regulation

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