Question 1

Which of the following best describes the primary function of the endocrine system?

Accepted Answer

To regulate and coordinate body activities through the release of hormones.

Question 2

A hormone is best defined as:

Accepted Answer

A chemical substance secreted by endocrine cells that travels in the blood to affect target cells.

Question 3

Which of the following statements correctly compares the nervous and endocrine systems?

Accepted Answer

The nervous system acts rapidly and locally, while the endocrine system acts slowly and can affect distant targets.

Question 4

Which of the following is NOT a major chemical class of hormones found in the human body?

Accepted Answer

Carbohydrate hormones

Question 5

Steroid hormones are transported in the blood primarily by:

Accepted Answer

Binding to plasma proteins such as albumin.

Question 6

Which type of receptor do peptide hormones typically bind to?

Accepted Answer

Cell membrane receptors on the surface of target cells.

Question 7

A steroid hormone exerts its effect on a target cell by:

Accepted Answer

Entering the cell and binding to an intracellular receptor, which then influences gene expression.

Question 8

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

Accepted Answer

A change in blood calcium levels triggering parathyroid hormone release.

Question 9

Negative feedback in hormone regulation is best illustrated by which scenario?

Accepted Answer

An increase in blood glucose causes insulin release, which lowers blood glucose and reduces further insulin secretion.

Question 10

The hypothalamus is anatomically located:

Accepted Answer

Above the anterior pituitary and connected to it by the infundibulum.

Question 11

Which term describes a hormone that stimulates another endocrine gland to release its hormone?

Accepted Answer

Tropic hormone

Question 12

The hypothalamus controls the release of anterior pituitary hormones by:

Accepted Answer

Releasing hormones into the hypophyseal portal system.

Question 13

Which of the following best describes the role of the hypothalamus in the production and release of posterior pituitary hormones?

Accepted Answer

It produces hormones that are stored and released by the posterior pituitary.

Question 14

Which gland is responsible for producing insulin, and what is the primary stimulus for its release?

Accepted Answer

Pancreas; increased blood glucose levels

Question 15

A patient presents with low blood calcium. Which hormone is most likely to be released, and from which gland?

Accepted Answer

Parathyroid hormone from the parathyroid gland

Question 16

Which layer of the adrenal gland produces mineralocorticoids such as aldosterone?

Accepted Answer

Zona glomerulosa

Question 17

Which hormone is released in response to neural stimulation and is involved in the 'fight or flight' response?

Accepted Answer

Epinephrine from the adrenal medulla

Question 18

Which of the following equations correctly represents the negative feedback loop for blood glucose regulation?

Accepted Answer

$$\Delta [Glucose] ightarrow 	ext{Insulin Release} ightarrow 	ext{Glucose Uptake} ightarrow \Delta [Glucose] \downarrow$$

Question 19

A patient with a tumor in the anterior pituitary is producing excess ACTH. Which hormone will be elevated as a result, and from which gland?

Accepted Answer

Cortisol from the adrenal cortex

Question 20

Which of the following scenarios best illustrates positive feedback in hormone regulation?

Accepted Answer

During childbirth, uterine contractions cause the release of oxytocin, which increases contractions and further oxytocin release.

Chapter 16: The Endocrine System – Study Guide

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