$$70 \text{ to } 110 \text{ mg/dL}$$

Question 1

Which of the following best describes the concept of homeostasis in animal physiology?

Accepted Answer

The process by which organisms maintain a constant internal environment despite changes in the external environment.

Question 2

Walter Cannon introduced the term 'homeostasis' to describe which physiological phenomenon?

Accepted Answer

The regulation of the internal environment to maintain stability.

Question 3

Which organ system is primarily responsible for integrating information about blood glucose levels and initiating a response to maintain homeostasis?

Accepted Answer

Central nervous system (CNS)

Question 4

A diabetic patient has a blood glucose level of 500 mg/dL. What is the normal set point range for blood glucose in a healthy individual?

Accepted Answer

$$70 	ext{ to } 110 	ext{ mg/dL}$$

Question 5

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

Accepted Answer

An increase in blood glucose triggers insulin release, which lowers blood glucose.

Question 6

In a homeostatic reflex pathway, which component detects changes in a regulated variable?

Accepted Answer

Sensor (e.g., chemosensor, mechanoreceptor)

Question 7

Which of the following best illustrates the difference between cross-sectional and longitudinal studies in physiology?

Accepted Answer

Cross-sectional studies analyze different samples at one point in time, while longitudinal studies follow the same sample over multiple time points.

Question 8

Which of the following is NOT a primary tissue type in the human body?

Accepted Answer

Connective tissue

Question 9

A scientist hypothesizes that cold temperatures cause birds to eat more. In an experiment, what is the independent variable?

Accepted Answer

Temperature

Question 10

Which of the following best describes the role of effectors in a homeostatic control system?

Accepted Answer

They carry out the response to restore the variable to its set point.

Question 11

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

Accepted Answer

Stimulus → Sensor → Integrator → Effector → Response

Question 12

Which of the following statements about negative feedback is TRUE?

Accepted Answer

Negative feedback opposes changes in a controlled variable to maintain stability.

Question 13

Which of the following is an example of a variable regulated by homeostasis?

Accepted Answer

Body temperature

Question 14

Which organelle is primarily responsible for energy production in animal cells?

Accepted Answer

Mitochondrion

Question 15

Which of the following best explains why organ systems are necessary in multicellular organisms?

Accepted Answer

They allow for specialized functions and efficient transformation of materials.

Question 16

Which of the following is a correct application of the scientific method in physiology?

Accepted Answer

Formulating a hypothesis, designing an experiment, collecting data, and analyzing results.

Question 17

If a homeostatic variable deviates from its set point and the body fails to compensate, what is the likely outcome?

Accepted Answer

Illness or disease

Question 18

Which of the following is a property of proteins relevant to physiology?

Accepted Answer

They are composed of amino acids and perform structural and enzymatic functions.

Question 19

Which of the following best describes the role of the hypothalamus in homeostasis?

Accepted Answer

It integrates sensory information and coordinates responses to maintain internal balance.

Question 20

A patient with major depression shows prolonged elevation of cortisol. Which feedback mechanism is likely impaired?

Accepted Answer

Negative feedback

Introduction to Animal Physiology: Homeostasis and the Science of Physiology

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