Q: According to the law of mass balance, which equation correctly represents the relationship between input, output, and body load?

$$\text{Mass balance} = \text{Existing body load} + \text{Intake or metabolic production} - \text{Excretion or metabolic removal}$$

Question 1

Which of the following best describes an emergent property in physiology?

Accepted Answer

A property that arises from the interaction of individual components, which cannot be predicted from the properties of the individual parts alone.

Question 2

Which approach explains the 'how' of a physiological process, such as how red blood cells transport oxygen?

Accepted Answer

Mechanistic approach

Question 3

Which of the following is the correct order of levels of organization in the human body, from smallest to largest?

Accepted Answer

Atoms, molecules, cells, tissues, organs, organ systems, organism

Question 4

Which statement about homeostasis is correct?

Accepted Answer

Homeostasis maintains a dynamic steady state, not equilibrium, between internal compartments.

Question 5

A patient with diabetes mellitus has abnormally high blood glucose. This is an example of:

Accepted Answer

A failure to maintain homeostasis

Question 6

According to the law of mass balance, which equation correctly represents the relationship between input, output, and body load?

Accepted Answer

$$	ext{Mass balance} = 	ext{Existing body load} + 	ext{Intake or metabolic production} - 	ext{Excretion or metabolic removal}$$

Question 7

Which of the following best describes a negative feedback loop?

Accepted Answer

A response that counteracts the initial stimulus, shutting off the response loop.

Question 8

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

Accepted Answer

Uterine contractions during childbirth

Question 9

Which compartment serves as the buffer zone between the outside world and the intracellular fluid?

Accepted Answer

Extracellular fluid (ECF)

Question 10

Which of the following statements about dynamic steady state and equilibrium is correct?

Accepted Answer

Dynamic steady state means materials are constantly moving between compartments, but there is no net movement.

Question 11

A scientist is designing an experiment to test the effect of a new drug on heart rate. Which variable should be placed on the X-axis of a graph?

Accepted Answer

The dose of the drug (independent variable)

Question 12

Which type of control system is restricted to a tissue or cell and does not involve long-distance signaling?

Accepted Answer

Local control

Question 13

Which of the following best describes feedforward control?

Accepted Answer

A mechanism that allows the body to anticipate change and initiate a response before the change occurs.

Question 14

Which of the following is a core concept in physiology that explains why the structure of the alveoli in the lungs is ideal for gas exchange?

Accepted Answer

Structure-function relationship

Question 15

A researcher wants to compare the effect of two different diets on blood cholesterol levels in a population. Which type of study design would be most appropriate?

Accepted Answer

Cross-sectional study

Question 16

Which of the following is an example of acclimatization?

Accepted Answer

A person gradually adjusting to high altitude over several weeks

Question 17

Which of the following best describes the placebo effect?

Accepted Answer

A physiological response to an inactive substance due to the subject's expectations

Question 18

Which of the following is the correct sequence of steps in a reflex pathway?

Accepted Answer

Stimulus, sensor, input signal, integrating center, output signal, target, response

Question 19

Which of the following best describes the concept of compartmentation in physiology?

Accepted Answer

The division of the body into separate sections with specialized functions

Question 20

Which of the following is a regulated physiological variable that must be maintained within a narrow range for proper function?

Accepted Answer

Blood pH

Introduction to Human Physiology: Core Concepts and Homeostasis

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