Q: According to the law of mass balance, which equation must be satisfied for a substance in the body to remain constant?

$$\text{Input} = \text{Output}$$

Question 1

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

Accepted Answer

A property that arises from complex, nonlinear interactions of different system components and cannot be predicted by studying individual parts alone.

Question 2

Which sequence correctly represents the hierarchy of biological organization in the human body?

Accepted Answer

Molecules → Cells → Tissues → Organs → Organ Systems

Question 3

Which of the following is the best example of homeostasis?

Accepted Answer

The body temperature remaining constant despite external temperature changes.

Question 4

What is the main difference between homeostasis and equilibrium in the context of body fluids?

Accepted Answer

Homeostasis refers to maintaining a dynamic steady state (stable disequilibrium), while equilibrium means equal concentrations across compartments.

Question 5

According to the law of mass balance, which equation must be satisfied for a substance in the body to remain constant?

Accepted Answer

$$	ext{Input} = 	ext{Output}$$

Question 6

Which of the following best describes the role of the extracellular fluid (ECF)?

Accepted Answer

It acts as a buffer between cells and the external environment.

Question 7

A patient has high potassium levels in their ECF. What is the most likely consequence?

Accepted Answer

Potassium levels in the ICF will be altered, potentially disrupting cellular function.

Question 8

Which of the following is a characteristic of negative feedback loops?

Accepted Answer

They oppose or remove the original stimulus to stabilize the system.

Question 9

During childbirth, the release of oxytocin causes uterine contractions, which in turn cause more oxytocin to be released. This is an example of:

Accepted Answer

Positive feedback

Question 10

Which of the following best illustrates feedforward control in human physiology?

Accepted Answer

The heart rate increasing in anticipation of exercise.

Question 11

Which of the following is true about local control mechanisms?

Accepted Answer

They are restricted to the tissues or cells involved and do not require long-distance signaling.

Question 12

Which of the following is NOT a regulated variable in homeostasis?

Accepted Answer

Hair color

Question 13

A person’s body temperature is lowest in the early morning and peaks in the late afternoon. This pattern is an example of:

Accepted Answer

A circadian rhythm

Question 14

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

Accepted Answer

It creates the output signal after processing the input.

Question 15

Which of the following scenarios best demonstrates the concept of dynamic steady state?

Accepted Answer

The concentration of sodium in the ECF remains constant over time, even though sodium ions are constantly moving in and out of cells.

Question 16

Which of the following is an example of reflex control?

Accepted Answer

Systemic regulation of blood pressure involving the nervous and endocrine systems.

Question 17

Which of the following statements about positive feedback loops is correct?

Accepted Answer

They require an external event to stop the response.

Question 18

If the body’s compensation for a homeostatic disruption fails, what is the likely outcome?

Accepted Answer

Illness or disease

Question 19

Which of the following best explains why emotion or intelligence cannot be predicted by studying individual nerve cells?

Accepted Answer

They are emergent properties resulting from complex interactions among nerve cells.

Question 20

Which of the following is an example of an anticipatory response created by a biorhythm?

Accepted Answer

The body temperature rising before waking up in the morning.

Introduction to Physiology and Homeostasis: Structured Study Notes

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