Q: Which equation best represents the calculation of membrane potential ($ V_m $) using the Nernst equation for a single ion?

$ V_m = \frac{RT}{zF} \ln \left( \frac{[\text{ion}]_{\text{outside}}}{[\text{ion}]_{\text{inside}}} \right) $

Question 1

Which of the following best describes the principle of homeostasis in the human body?

Accepted Answer

The body's ability to maintain a stable internal environment despite external changes.

Question 2

A patient presents with a fracture that is healing slowly. Which process is most directly responsible for bone remodeling and repair?

Accepted Answer

Osteoblast activity depositing new bone matrix.

Question 3

Which equation correctly represents the relationship between concentration gradient and rate of diffusion across a cell membrane?

Accepted Answer

$ J = -D \frac{dC}{dx} $

Question 4

Which histological feature distinguishes skeletal muscle tissue from cardiac muscle tissue?

Accepted Answer

Skeletal muscle fibers are multinucleated and lack intercalated discs.

Question 5

A neuron receives a stimulus that causes the membrane potential to change from $ -70 	ext{ mV} $ to $ +30 	ext{ mV} $. What event is occurring?

Accepted Answer

Depolarization due to influx of sodium ions.

Question 6

Which of the following best explains why epithelial tissue is well-suited for protection?

Accepted Answer

Epithelial cells are tightly packed with minimal extracellular matrix.

Question 7

During muscle contraction, which equation represents the relationship between force ($ F $), muscle cross-sectional area ($ A $), and stress ($ \sigma $)?

Accepted Answer

$ \sigma = \frac{F}{A} $

Question 8

A patient with severe burns is at risk for dehydration. Which function of the integumentary system is most compromised?

Accepted Answer

Prevention of water loss through the skin.

Question 9

Which of the following is a correct application of anatomical terminology when describing the location of the heart?

Accepted Answer

The heart is medial to the lungs.

Question 10

Which macromolecule is primarily responsible for catalyzing biochemical reactions in cells?

Accepted Answer

Proteins (enzymes)

Question 11

A patient is diagnosed with osteoporosis. Which cellular activity is most likely increased?

Accepted Answer

Osteoclast-mediated bone resorption.

Question 12

Which equation best represents the calculation of membrane potential ($ V_m $) using the Nernst equation for a single ion?

Accepted Answer

$ V_m = \frac{RT}{zF} \ln \left( \frac{[	ext{ion}]_{	ext{outside}}}{[	ext{ion}]_{	ext{inside}}} ight) $

Question 13

Which scenario best illustrates the overlapping roles of the nervous system from sensory reception to integration to output?

Accepted Answer

Touching a hot stove, feeling pain, and quickly withdrawing your hand.

Question 14

Which of the following best describes the function of the neuromuscular junction?

Accepted Answer

It transmits the action potential from a motor neuron to a muscle fiber.

Question 15

Which tissue type is most likely to be found lining the inside of blood vessels?

Accepted Answer

Simple squamous epithelium

Question 16

A student observes a slide under the microscope and identifies cells with large central nuclei, abundant rough endoplasmic reticulum, and prominent nucleoli. Which cell function is most likely associated with these features?

Accepted Answer

Active protein synthesis

Question 17

Which equation represents the calculation of total points earned as a percentage of total points possible in this course?

Accepted Answer

$ 	ext{Percentage} = \frac{	ext{Points Earned}}{	ext{Total Points Possible}} 	imes 100 $

Question 18

Which of the following best describes the function of the central nervous system?

Accepted Answer

Integration and processing of sensory information.

Question 19

A patient is unable to move their arm after a stroke. Which structure is most likely damaged?

Accepted Answer

Motor cortex of the central nervous system.

Anatomy and Physiology 50A: Course Structure, Learning Outcomes, and Schedule

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