Q: Which equation best represents the relationship between the rate of diffusion and the factors that influence it, as shown in the sixth image?

$$\text{rate of diffusion} \propto \text{surface area} \times \text{concentration gradient} \times \text{membrane permeability}$$

Question 1

Which of the following best describes the process depicted in the first image, where an organism attempts to compensate for a loss of homeostasis?

Accepted Answer

A process where compensation may succeed, resulting in wellness, or fail, resulting in illness or disease

Question 2

According to the response loop described in the second image, what is the correct sequence of events when a regulated variable moves out of its desirable range?

Accepted Answer

Stimulus → Sensor → Input signal → Integrating center → Output signal → Target → Response

Question 3

The third image illustrates a feedback loop involved in childbirth. Which type of feedback is this, and what is its physiological significance?

Accepted Answer

Positive feedback; it amplifies uterine contractions until delivery occurs

Question 4

Based on the fourth image, which of the following statements is TRUE regarding the relationship between osmolarity and tonicity?

Accepted Answer

A hyposmotic solution is always hypotonic.

Question 5

A patient is given an intravenous solution of 5% dextrose in water (D5W). According to the fifth image, what are the osmolarity and tonicity of this solution?

Accepted Answer

Hyperosmotic and hypotonic

Question 6

Which equation best represents the relationship between the rate of diffusion and the factors that influence it, as shown in the sixth image?

Accepted Answer

$$	ext{rate of diffusion} \propto 	ext{surface area} 	imes 	ext{concentration gradient} 	imes 	ext{membrane permeability}$$

Question 7

A cell is placed in a solution that is isosmotic but contains a high concentration of penetrating solutes. What will happen to the cell?

Accepted Answer

The cell will swell because the solution is hypotonic due to the presence of penetrating solutes.

Question 8

Which of the following best explains why osmolarity alone cannot predict the tonicity of a solution?

Accepted Answer

Tonicity depends on the nature of the solutes, specifically whether they are penetrating or nonpenetrating.

Question 9

Which intravenous solution would be most appropriate for a patient who needs to avoid cell swelling, based on the table in the fifth image?

Accepted Answer

0.9% saline (Normal saline)

Question 10

In the context of homeostasis, what is the role of the integrating center as described in the second image?

Accepted Answer

It evaluates input from the sensor and initiates an output signal to restore the regulated variable.

Question 11

Which of the following is an example of a positive feedback loop in human physiology, as shown in the third image?

Accepted Answer

Uterine contractions during childbirth

Question 12

A solution is hyperosmotic and isotonic. Which of the following could be an example of this solution, based on the fifth image?

Accepted Answer

5% dextrose in 0.9% saline

Question 13

If a cell is placed in a hyposmotic solution, what can you predict about the tonicity of the solution?

Accepted Answer

It must be hypotonic.

Question 14

Which of the following changes would increase the rate of diffusion across a cell membrane, according to the equation in the sixth image?

Accepted Answer

Increasing the membrane permeability

Question 15

A patient receives an IV solution that is hyperosmotic and hypotonic. Which solution is this, based on the table in the fifth image?

Accepted Answer

5% dextrose in water

Core Principles of Physiology: Homeostasis, Membrane Transport, and Body Compartments

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