Q: Which of the following equations best represents the law of mass balance in physiology?

$$\text{Existing body load} + \text{Intake} = \text{Output} + \text{Accumulation}$$

Question 1

Which of the following best describes the primary focus of physiology?

Accepted Answer

The study of the normal function of living organisms.

Question 2

Which of the following acts as a buffer zone between the outside world and most of the cells of the body?

Accepted Answer

Extracellular fluid

Question 3

A patient is experiencing a disease state that disrupts the normal function of their body. Which branch of science is most directly concerned with understanding these changes?

Accepted Answer

Physiology

Question 4

Homeostasis is best defined as:

Accepted Answer

The ability of the body to quickly restore changed conditions to normal.

Question 5

Oxytocin release during labor causes more uterine contractions, which further dilate the cervix. What type of feedback does this represent?

Accepted Answer

Positive feedback

Question 6

Which system does NOT exchange material with the internal and external environments?

Accepted Answer

Circulatory system

Question 7

Why are physiology and anatomy frequently studied together?

Accepted Answer

Because the structure of a cell, tissue, or organ often provides clues to its function.

Question 8

You go outside on a cold day and start to shiver. In a response loop, what step does shivering represent?

Accepted Answer

Response

Question 9

A control system includes three main parts: input signal, integrating center, and output signal. Which of the following best illustrates this concept in regulating blood glucose after eating?

Accepted Answer

Blood glucose rises (input), pancreas detects change (integrating center), insulin is released (output).

Question 10

The law of mass balance states:

Accepted Answer

Any gain must be offset by an equal loss.

Question 11

During exercise, vasodilation of blood vessels supplying muscles in response to increased carbon dioxide is an example of:

Accepted Answer

Local control

Question 12

Which type of feedback loop is most commonly used to maintain homeostasis in the body?

Accepted Answer

Negative feedback loop

Question 13

A patient has lost a significant amount of blood. Which physiological mechanism will help restore blood pressure to normal?

Accepted Answer

Negative feedback loop involving vasoconstriction.

Question 14

Which of the following equations best represents the law of mass balance in physiology?

Accepted Answer

$$	ext{Existing body load} + 	ext{Intake} = 	ext{Output} + 	ext{Accumulation}$$

Question 15

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

Accepted Answer

Release of oxytocin during childbirth.

Question 16

A patient is exposed to a cold environment. Which physiological process is most likely to occur to maintain homeostasis?

Accepted Answer

Shivering to generate heat.

Question 17

Which of the following best describes the role of the integrating center in a physiological control system?

Accepted Answer

It compares the input signal to a set point and initiates a response.

Question 18

Which of the following is NOT a function of the urinary system?

Accepted Answer

Exchange of gases with the environment.

Question 19

A patient eats a large meal high in carbohydrates. Which control system will regulate their blood glucose levels?

Accepted Answer

Negative feedback loop involving insulin release.

Question 20

Which of the following best describes the relationship between anatomy and physiology?

Accepted Answer

Structure often determines function, so both are studied together.

Physiology Review: Homeostasis, Feedback, and Body Systems

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