Q: Which of the following equations correctly represents the process of gluconeogenesis stimulated by glucagon?

$\text{Lactic acid} + \text{Amino acids} \rightarrow \text{Glucose}$

Q: Which of the following equations represents the breakdown of glycogen to glucose stimulated by glucagon?

$\text{Glycogen} \rightarrow \text{Glucose}$

Question 1

Which of the following best describes a key difference between the nervous system and the endocrine system?

Accepted Answer

The nervous system acts at specific locations determined by axon pathways, while the endocrine system acts at diffuse locations where targets can be anywhere blood reaches.

Question 2

A patient presents with excessive thirst, frequent urination, and unexplained weight loss. Laboratory tests reveal high blood glucose and ketone bodies in the urine. Which endocrine disorder is most likely responsible for these symptoms?

Accepted Answer

Diabetes mellitus

Question 3

Which hormone is secreted by the alpha cells of the pancreatic islets and acts as a potent hyperglycemic agent?

Accepted Answer

Glucagon

Question 4

Which of the following is an example of hormonal antagonism?

Accepted Answer

Insulin and glucagon

Question 5

A child is diagnosed with pituitary dwarfism. Which hormone is most likely deficient?

Accepted Answer

Growth hormone (GH)

Question 6

Which of the following best explains the negative feedback mechanism regulating thyroid hormone secretion?

Accepted Answer

Increased thyroid hormone levels inhibit the release of TRH from the hypothalamus and TSH from the anterior pituitary.

Question 7

Which hormone is released in response to low blood calcium levels and acts to increase blood calcium by stimulating bone resorption, kidney reabsorption, and intestinal absorption?

Accepted Answer

Parathyroid hormone (PTH)

Question 8

A patient with Graves' disease is likely to present with which of the following symptoms?

Accepted Answer

Elevated metabolic rate, sweating, rapid and irregular heartbeats, and exophthalmos

Question 9

Which of the following equations correctly represents the process of gluconeogenesis stimulated by glucagon?

Accepted Answer

$	ext{Lactic acid} + 	ext{Amino acids} ightarrow 	ext{Glucose}$

Question 10

Which layer of the adrenal cortex is responsible for producing mineralocorticoids such as aldosterone?

Accepted Answer

Zona glomerulosa

Question 11

A patient with Cushing's syndrome is likely to exhibit which of the following clinical signs?

Accepted Answer

Buffalo hump, moon face, and thinning of limbs

Question 12

Which of the following best describes the permissiveness interaction between hormones?

Accepted Answer

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

Question 13

Which of the following is NOT a function of the hypothalamus?

Accepted Answer

Secretion of insulin

Question 14

Which of the following best explains why a lack of iodine in the diet can lead to the development of a goiter?

Accepted Answer

Iodine deficiency decreases TH levels, which increases TSH secretion and causes thyroid enlargement.

Question 15

Which of the following equations represents the breakdown of glycogen to glucose stimulated by glucagon?

Accepted Answer

$	ext{Glycogen} ightarrow 	ext{Glucose}$

Question 16

Which hormone is secreted by parafollicular cells of the thyroid gland and acts to lower blood calcium levels?

Accepted Answer

Calcitonin

Question 17

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

Accepted Answer

Decreased plasma glucose and sodium levels

Question 18

Which of the following best describes the role of insulin in glucose metabolism?

Accepted Answer

Insulin lowers blood glucose by enhancing membrane transport of glucose into fat and muscle cells.

Question 19

Which of the following is a direct effect of thyroid hormone (TH) on the body?

Accepted Answer

Promotion of normal growth and development, especially of the nervous system

Question 20

A patient presents with tetany, muscle spasms, and respiratory paralysis. Which endocrine disorder is most likely responsible?

Accepted Answer

Hypoparathyroidism

The Endocrine System: Structure, Function, and Regulation

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