Q: Which of the following equations correctly represents the relationship between the rate of diffusion ($$R$$), surface area ($$A$$), concentration gradient ($$\Delta C$$), and membrane thickness ($$d$$)?

$$R = \frac{A \times \Delta C}{d}$$

Question 1

Which of the following best describes the difference between anatomy and physiology?

Accepted Answer

Anatomy studies the structure of body parts, while physiology studies how those parts function.

Question 2

Which of the following organ systems is primarily responsible for transporting nutrients, gases, and wastes throughout the body?

Accepted Answer

Cardiovascular system

Question 3

A patient is given a solution with a higher solute concentration than their intracellular fluid. What will happen to their cells?

Accepted Answer

The cells will shrink as water moves out of the cell.

Question 4

Which of the following best describes the role of enzymes in the body?

Accepted Answer

Enzymes act as biological catalysts, speeding up chemical reactions without being consumed.

Question 5

Which of the following is a function of the skeletal muscle tissue?

Accepted Answer

Movement of bones and voluntary control

Question 6

A person is unable to produce enough ATP during muscle contraction. Which organelle is most likely malfunctioning?

Accepted Answer

Mitochondrion

Question 7

Which of the following best explains why the plasma membrane is described as a 'fluid mosaic'?

Accepted Answer

It consists of a double layer of phospholipids with proteins and other molecules that move laterally within the layer.

Question 8

Which of the following connective tissues is most specialized for storing energy?

Accepted Answer

Adipose tissue

Question 9

Which of the following equations correctly represents the relationship between the rate of diffusion ($$R$$), surface area ($$A$$), concentration gradient ($$\Delta C$$), and membrane thickness ($$d$$)?

Accepted Answer

$$R = \frac{A 	imes \Delta C}{d}$$

Question 10

Which of the following best describes the function of osteoclasts in bone physiology?

Accepted Answer

Osteoclasts break down bone matrix, releasing calcium into the blood.

Question 11

A patient has a mutation that prevents the formation of gap junctions in cardiac muscle. Which of the following is most likely to occur?

Accepted Answer

The heart muscle cells will not be able to communicate efficiently, leading to uncoordinated contractions.

Question 12

Which of the following best describes the role of the sarcoplasmic reticulum in skeletal muscle contraction?

Accepted Answer

It stores and releases calcium ions necessary for muscle contraction.

Question 13

Which of the following is a correct sequence of events in the sliding filament model of muscle contraction?

Accepted Answer

Calcium binds to troponin, myosin heads bind to actin, power stroke occurs, ATP binds to myosin, myosin detaches from actin.

Question 14

Which of the following best describes the function of Schwann cells in the peripheral nervous system?

Accepted Answer

They form myelin sheaths around axons, increasing the speed of nerve impulse conduction.

Question 15

Which neurotransmitter is primarily responsible for stimulating skeletal muscle contraction at the neuromuscular junction?

Accepted Answer

Acetylcholine

Question 16

Which of the following best explains why action potentials only travel in one direction along an axon?

Accepted Answer

The refractory period prevents the action potential from traveling backward.

Question 17

Which of the following is a function of the parasympathetic division of the autonomic nervous system?

Accepted Answer

Stimulating digestion and reducing heart rate

Question 18

Which of the following best describes the effect of a neurotransmitter binding to an inhibitory postsynaptic receptor?

Accepted Answer

It causes hyperpolarization, making the neuron less likely to fire an action potential.

Question 19

Which of the following best describes the general function of sympathetic tone in the body?

Accepted Answer

It keeps blood vessels partially constricted, helping to regulate blood pressure.

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