Q: Which equation correctly represents the Law of Mass Balance as applied to the human body?

$$\text{Total amount} = \text{Intake} + \text{Production} - \text{Excretion} - \text{Metabolism}$$

Q: A scientist is analyzing the clearance of a drug from the human body. Which equation would she use to calculate clearance?

$$\text{Clearance} = \frac{\text{Excretion rate}}{\text{Plasma concentration}}$$

Question 1

Which of the following best describes the difference between the teleological and mechanistic approaches to physiology?

Accepted Answer

The teleological approach explains physiological processes by their purpose, while the mechanistic approach explains them by the underlying physical and chemical mechanisms.

Question 2

A scientist is testing the effect of a new drug on blood pressure. To minimize bias, she randomly assigns subjects to receive either the drug or a placebo, and neither the subjects nor the researchers know who receives which treatment. What type of study design is this?

Accepted Answer

Double-blind study

Question 3

Which equation correctly represents the Law of Mass Balance as applied to the human body?

Accepted Answer

$$	ext{Total amount} = 	ext{Intake} + 	ext{Production} - 	ext{Excretion} - 	ext{Metabolism}$$

Question 4

Which organ system is primarily responsible for maintaining homeostasis of extracellular fluid (ECF) composition?

Accepted Answer

Urinary system

Question 5

A patient has a pathological condition that disrupts compartmentation in their cells. Which cellular structure is most likely affected?

Accepted Answer

Cell membrane

Question 6

Which of the following is an example of negative feedback in human physiology?

Accepted Answer

Regulation of blood glucose by insulin

Question 7

A researcher wants to study the effect of temperature on enzyme activity. She varies the temperature and measures the rate of reaction. Which is the independent variable in this experiment?

Accepted Answer

Temperature

Question 8

Which of the following best describes the function of a sensor in a physiological feedback loop?

Accepted Answer

It detects changes in a variable and sends information to the integrating center.

Question 9

A scientist is designing an experiment to test a new hypothesis. Which of the following is NOT a key element of scientific inquiry?

Accepted Answer

Ignoring data that contradicts the hypothesis

Question 10

Which of the following scenarios best illustrates the placebo effect?

Accepted Answer

A patient reports pain relief after receiving a sugar pill, believing it is a painkiller.

Question 11

Which of the following is the correct order of steps in a simple reflex response loop?

Accepted Answer

Stimulus → Sensor → Integrating center → Effector → Response

Question 12

A scientist is analyzing the clearance of a drug from the human body. Which equation would she use to calculate clearance?

Accepted Answer

$$	ext{Clearance} = \frac{	ext{Excretion rate}}{	ext{Plasma concentration}}$$

Question 13

Which of the following best explains the concept of steady state in physiology?

Accepted Answer

A condition in which the input and output of a substance are balanced, but not necessarily equal to zero.

Question 14

Which of the following is an example of feedforward control in human physiology?

Accepted Answer

Salivation in response to the sight or smell of food before food enters the mouth.

Question 15

A researcher is studying circadian rhythms in humans. Which variable is most likely to show a circadian pattern?

Accepted Answer

Core body temperature

Question 16

Which of the following is a dependent variable in an experiment measuring the effect of exercise on heart rate?

Accepted Answer

Heart rate

Question 17

Which of the following is a real-world example of acclimatization?

Accepted Answer

Increased red blood cell production after moving to high altitude

Question 18

A scientist wants to graph the relationship between two continuous variables. Which type of graph is most appropriate?

Accepted Answer

Scatter plot

Question 19

Which of the following best describes the nocebo effect?

Accepted Answer

A negative outcome resulting from negative expectations about a treatment

Question 20

Which of the following is NOT a function of the cell membrane?

Accepted Answer

Synthesizing proteins for cellular use

Introduction to Anatomy & Physiology: Key Concepts and Terminology

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