Q: Which of the following equations correctly represents the conversion of glycogen to glucose in the liver?

$$\text{Glycogen} \xrightarrow{\text{Glucagon}} \text{Glucose}$$

Question 1

Which of the following best describes the primary function of hormones secreted by endocrine glands?

Accepted Answer

They regulate the metabolic functions of other cells.

Question 2

Amino acid-based hormones, except for thyroid hormone, exert their effects by binding to receptors located where?

Accepted Answer

On the plasma membrane of target cells

Question 3

Which of the following is a correct statement about steroid hormones?

Accepted Answer

They bind to intracellular receptors and directly activate genes.

Question 4

What is the main difference between the action of amino acid-based hormones and steroid hormones?

Accepted Answer

Amino acid-based hormones act via plasma membrane receptors and second messengers, while steroid hormones act via intracellular receptors.

Question 5

Which organ produces erythropoietin, and what is its primary target?

Accepted Answer

The kidney; bone marrow

Question 6

Which of the following is NOT a major endocrine gland?

Accepted Answer

Heart

Question 7

What is the effect of insulin binding to its target cells?

Accepted Answer

It promotes glucose uptake by cells, lowering blood glucose levels.

Question 8

Which of the following best describes the mechanism by which glucagon elevates blood glucose levels?

Accepted Answer

It promotes the conversion of glycogen to glucose in the liver.

Question 9

Which of the following is a cardinal sign of diabetes mellitus?

Accepted Answer

Polyuria

Question 10

Which feedback mechanism primarily controls blood levels of most hormones?

Accepted Answer

Negative feedback

Question 11

A patient presents with excessive insulin secretion resulting in hypoglycemia. Which of the following symptoms would you expect?

Accepted Answer

Confusion, sweating, and tremors

Question 12

Which of the following best describes the role of the pancreas in the endocrine system?

Accepted Answer

It produces both hormones and exocrine products.

Question 13

Which cell type in the pancreatic islets is responsible for producing glucagon?

Accepted Answer

Alpha cells

Question 14

Which of the following is a direct effect of hormone binding to a target cell?

Accepted Answer

Alteration of plasma membrane permeability

Question 15

Which of the following equations correctly represents the conversion of glycogen to glucose in the liver?

Accepted Answer

$$	ext{Glycogen} \xrightarrow{	ext{Glucagon}} 	ext{Glucose}$$

Question 16

Which of the following best explains why target cells respond to specific hormones?

Accepted Answer

Target cells have specific receptors for the hormone.

Question 17

Which of the following is an example of humoral stimulus for hormone release?

Accepted Answer

Increasing blood calcium concentration stimulating calcitonin release

Question 18

Which of the following hormones is classified as lipid-soluble and can pass through the cell membrane?

Accepted Answer

Thyroid hormone

Question 19

Which of the following best describes the role of second messenger systems in hormone action?

Accepted Answer

They transmit the signal from amino acid-based hormones bound to plasma membrane receptors.

Question 20

Which of the following is a multi-step process involving both humoral and hormonal stimuli?

Accepted Answer

Low blood calcium stimulates parathyroid hormone release, which then increases calcium absorption in the intestines after stimulating vitamin D activation.

The Endocrine System: Hormones, Glands, and Mechanisms of Action

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