Question 1

Which of the following best describes homeostasis as defined by Walter Cannon?

Accepted Answer

The ability of the body to maintain a relatively stable internal environment despite continuous changes in the outside world.

Question 2

Which of the following is NOT considered a survival need for humans?

Accepted Answer

High atmospheric pressure

Question 3

A patient is exposed to a cold environment. Which homeostatic mechanism is primarily responsible for returning their body temperature to normal?

Accepted Answer

Negative feedback

Question 4

Which of the following is an example of positive feedback in the human body?

Accepted Answer

Enhancement of labor contractions by oxytocin

Question 5

Which of the following best explains why homeostatic imbalance increases with aging?

Accepted Answer

Control systems become less efficient, increasing the risk of disease.

Question 6

Which division of the autonomic nervous system is primarily responsible for the 'fight-or-flight' response?

Accepted Answer

Sympathetic division

Question 7

Which of the following organs receives only sympathetic innervation?

Accepted Answer

Adrenal medulla

Question 8

Which of the following statements about the endocrine system is TRUE?

Accepted Answer

It acts with the nervous system to coordinate and integrate the activity of body cells.

Question 9

Which of the following is a characteristic of hormones?

Accepted Answer

They are chemical messengers released to regulate the metabolic activity of other cells in the body.

Question 10

Which of the following best describes the difference between endocrine and exocrine glands?

Accepted Answer

Endocrine glands secrete hormones into the blood, while exocrine glands secrete substances through ducts to a membrane surface.

Question 11

Which of the following is a steroid hormone?

Accepted Answer

Gonadal hormone

Question 12

A hormone binds to a plasma membrane receptor and activates a G protein. Which second messenger is most likely involved in this pathway?

Accepted Answer

$$	ext{cAMP}$$

Question 13

Which brain region is considered the main integration center for autonomic nervous system activity?

Accepted Answer

Hypothalamus

Question 14

Which of the following best describes the effect of sympathetic tone on blood vessels?

Accepted Answer

It causes partial constriction of blood vessels, maintaining blood pressure.

Question 15

Which of the following is an example of a feedforward (anticipatory) response?

Accepted Answer

Release of saliva and digestive juices upon smelling food before ingestion.

Question 16

Which of the following is TRUE regarding the parasympathetic division?

Accepted Answer

It promotes housekeeping activities such as digestion and defecation.

Question 17

Which of the following is a cooperative effect of the sympathetic and parasympathetic divisions?

Accepted Answer

Reproduction

Question 18

Which of the following best explains why the sympathetic division has more diffuse and long-lasting effects compared to the parasympathetic division?

Accepted Answer

Norepinephrine and epinephrine from the adrenal medulla are inactivated more slowly than acetylcholine.

Question 19

Which of the following is required for a cell to respond to a hormone?

Accepted Answer

The cell must have specific receptors for that hormone.

Question 20

Which of the following is a function of the endocrine system?

Accepted Answer

Regulation of cellular metabolism and energy balance

Homeostasis, Autonomic Nervous System, and Endocrine System: Structured Study Notes

Study Guide - Practice Questions