Question 1

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

Accepted Answer

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

Question 2

A patient is experiencing muscle fatigue after intense exercise. Which physiological process is most directly responsible for the increased oxygen consumption post-exercise (EPOC)?

Accepted Answer

Restoration of ATP and creatine phosphate stores.

Question 3

Which feedback loop is correctly matched with its effect on homeostasis?

Accepted Answer

Negative feedback loop: Reduces the effect of the original stimulus to maintain balance.

Question 4

Which equation best represents the calculation of osmotic pressure ($$\Pi) $$across a plasma membrane?

Accepted Answer

$$\Pi = iCRT$$

Question 5

A nerve impulse travels along a neuron due to changes in membrane potential. Which ion movement is primarily responsible for the depolarization phase of the action potential?

Accepted Answer

Influx of $$Na^+$$ ions into the cell.

Question 6

Which of the following best explains the sliding-filament mechanism of muscle contraction?

Accepted Answer

Actin filaments slide past myosin filaments, shortening the sarcomere.

Question 7

Which of the following is NOT a function of the plasma membrane?

Accepted Answer

Synthesis of proteins.

Question 8

A patient with a genetic defect in sodium-potassium pumps would most likely experience which cellular problem?

Accepted Answer

Impaired maintenance of resting membrane potential.

Question 9

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 10

Which process is an example of passive transport across the plasma membrane?

Accepted Answer

Osmosis of water molecules.

Question 11

Which of the following best illustrates the concept of structure-function relationship in physiology?

Accepted Answer

The biconcave shape of red blood cells increases their surface area for gas exchange.

Question 12

During muscle contraction, which molecule binds to troponin to initiate the exposure of binding sites on actin?

Accepted Answer

Calcium ions ($$Ca^{2+})$$

Question 13

Which of the following is a correct statement about the fluid mosaic model of the plasma membrane?

Accepted Answer

Membrane proteins and lipids can move laterally within the layer.

Question 14

A person is unable to voluntarily move their limbs due to damage in the corticospinal tract. Which system is most directly affected?

Accepted Answer

Motor output from the central nervous system.

Question 15

Which of the following is a correct example of a positive feedback mechanism in the human body?

Accepted Answer

Release of oxytocin during childbirth to intensify uterine contractions.

Question 16

Which equation correctly represents the relationship between tension ($$T$$), force ($$F$$), and cross-sectional area ($$A) in $$muscle physiology?

Accepted Answer

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

Question 17

Which of the following is a direct result of atrophy in skeletal muscle?

Accepted Answer

Decrease in muscle fiber diameter and strength.

Question 18

Which of the following best describes the role of lower motor neurons in voluntary movement?

Accepted Answer

They transmit motor commands from the central nervous system to skeletal muscles.

Question 19

Which of the following is a correct statement about the levels of structural organization in the human body?

Accepted Answer

Cells combine to form tissues, which then form organs.

Question 20

Which process is most likely to be impaired if vesicular transport in a cell is disrupted?

Accepted Answer

Exocytosis of neurotransmitters.

Anatomy & Physiology Study Guide: Human Physiology, Cell Physiology, and Muscle Physiology

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