Question 1

Which of the following is NOT a regulatory function of the endocrine system?

Accepted Answer

Muscle contraction is primarily regulated by the nervous system, not the endocrine system.

Question 2

Which of the following is/are regulatory functions of the endocrine system?

Accepted Answer

The endocrine system regulates various body functions, including tissue maturation, water balance, heart rate and blood pressure, and reproductive functions, making all the choices correct.

Question 3

Which endocrine gland is NOT found in the cranial cavity?

Accepted Answer

The thyroid gland is not found in the cranial cavity. It is located in the neck.

Question 4

Which endocrine gland in NOT found in the neck or chest?

Accepted Answer

The pineal gland is located in the brain, not in the neck or chest.

Question 5

Which of the following is NOT a general characteristic of the endocrine system?

Accepted Answer

The number of major endocrine glands is not fixed at 12 for males; it varies depending on classification and context.

Question 6

Hormones act as amplitude-modulated signals, which means that the strength of the signal depends on

Accepted Answer

Hormones act as amplitude-modulated signals, which means that the strength of the signal depends on the concentration of the chemical.

Question 7

A hormone is traditionally described as a ligand that

Accepted Answer

Hormones are produced by cells, enter the bloodstream or interstitial fluid, and act on specific target tissues, making all the choices correct.

Question 8

The secretion of hormones is mainly controlled by

Accepted Answer

Hormone secretion is primarily regulated by negative-feedback mechanisms, which help maintain homeostasis by reducing the output or activity of any organ or system back to its normal range of functioning.

Question 9

Which of the following is NOT a method of regulating hormone secretion?

Accepted Answer

Enzymes are not a method of regulating hormone secretion; they are biological catalysts that speed up chemical reactions in the body. Hormone secretion is typically regulated by the nervous system, blood levels of chemicals, and other hormones.

Question 10

Which method of secretion control is being employed when high blood calcium levels cause the secretion of calcitonin?

Accepted Answer

Blood levels of chemicals regulate the secretion of calcitonin in response to high blood calcium levels.

Question 11

Which method of secretion control is being employed when adrenocorticotropic hormone stimulates the adrenal cortex to secrete its hormones?

Accepted Answer

Adrenocorticotropic hormone (ACTH) stimulates the adrenal cortex to secrete its hormones, which is an example of hormonal control, where one hormone regulates the secretion of another hormone.

Question 12

What type of hormone will generally be bound to binding proteins?

Accepted Answer

Lipid-soluble hormones, such as steroid hormones, are generally bound to binding proteins in the bloodstream to increase their solubility and prolong their half-life.

Question 13

The tendency for each type of hormone to one type of receptor and not to others is called

Accepted Answer

Specificity refers to the ability of a hormone to bind to a specific receptor, distinguishing it from other receptors.

Question 14

A drug that binds to a hormone receptor and activates it is called a/an

Accepted Answer

An agonist is a drug that binds to a hormone receptor and activates it.

Question 15

Hormone receptors on the plasma membrane are called

Accepted Answer

Membrane-bound receptors are located on the plasma membrane and interact with hormones that cannot pass through the cell membrane.

Question 16

Which of the following is NOT a hormone type that binds to a membrane-bound receptor?

Accepted Answer

The answer of Which of the following is NOT a...

Question 17

Which of the following is NOT a hormone that binds to an intracellular receptor?

Accepted Answer

Glycoproteins are not hormones that bind to intracellular receptors; they typically bind to cell surface receptors.

Question 18

What is the correct sequence of events when a hormone binds to its membrane-bound receptor?
G protein binds to the altered receptor
G protein separates from the receptor
GTP replaces GDP on the $\alpha$ subunit
The $\alpha$  subunit separates from the $\beta$ and $\gamma$subunits
The receptor is altered

Accepted Answer

The correct sequence is: The receptor is altered (5), G protein binds to the altered receptor (1), GTP replaces GDP on the α subunit (3), G protein separates from the receptor (2), and the α subunit separates from the β and γ subunits (4).

Question 19

After the $\alpha$ subunit of the G protein separates from the other subunits, it can

Accepted Answer

The $\alpha$ subunit of the G protein can interact with ion channels to open or close them (Choice A) and can also change the activity of enzymes inside the cell (Choice B).

Question 20

Which unit of the G protein, when activated, will cause changes to occur inside the cell?

Accepted Answer

The alpha subunit of the G protein, when activated, dissociates from the beta and gamma subunits and interacts with other proteins or enzymes in the cell, leading to various intracellular changes.

Quiz 15: Endocrine System