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

Question 1

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

Accepted Answer

The process by which the body maintains a stable internal environment despite changes in external conditions.

Question 2

A patient presents with a burn that affects both the epidermis and the dermis. Which type of tissue is primarily damaged?

Accepted Answer

Epithelial tissue

Question 3

Which of the following equations correctly represents the Nernst equation for calculating membrane potential for a single ion?

Accepted Answer

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

Question 4

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

Accepted Answer

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

Question 5

A patient has a fracture in the femur. Which type of bone is the femur classified as?

Accepted Answer

Long bone

Question 6

Which of the following best describes the function of synovial fluid in a joint?

Accepted Answer

It lubricates the joint, reducing friction between articular surfaces.

Question 7

If a neuron is unable to release neurotransmitters at the synapse, which process will be directly affected?

Accepted Answer

Transmission of the signal to the postsynaptic cell

Question 8

Which of the following is a correct sequence of events in the reflex arc?

Accepted Answer

Receptor → Sensory neuron → Integration center → Motor neuron → Effector

Question 9

Which equation best represents the relationship between force, mass, and acceleration in muscle contraction?

Accepted Answer

$$F = m \cdot a$$

Question 10

A patient is unable to distinguish between hot and cold objects with their skin. Which sensory receptor is most likely malfunctioning?

Accepted Answer

Thermoreceptors

Question 11

Which of the following best explains why the axon hillock is the site of action potential initiation?

Accepted Answer

It contains the highest density of voltage-gated sodium channels.

Question 12

Which of the following is a function of the skeletal system?

Accepted Answer

Storage of minerals such as calcium and phosphorus

Question 13

A patient with myasthenia gravis has impaired neuromuscular transmission. Which structure is most likely affected?

Accepted Answer

Neuromuscular junction

Question 14

Which of the following best describes the role of ATP in muscle contraction?

Accepted Answer

ATP is required for the detachment of myosin heads from actin filaments.

Question 15

Which equation correctly represents the calculation of energy expenditure during muscle contraction?

Accepted Answer

$$E = P \cdot t$$

Question 16

A patient is unable to flex their elbow after an injury. Which muscle is most likely affected?

Accepted Answer

Biceps brachii

Question 17

Which of the following best describes the function of the central nervous system (CNS)?

Accepted Answer

It processes and integrates sensory information and coordinates responses.

Question 18

Which of the following is a correct description of the structure of a synovial joint?

Accepted Answer

It contains a joint cavity filled with synovial fluid and articular cartilage covering bone surfaces.

Question 19

A patient is unable to taste sweet foods but can taste salty and sour foods. Which cranial nerve is most likely affected?

Accepted Answer

Facial nerve (VII)

Question 20

Which of the following best explains the role of the sodium-potassium pump in maintaining the resting membrane potential?

Accepted Answer

It moves $$Na^{+}$$ out of the cell and $$K^{+}$$ into the cell, maintaining a negative charge inside.

Anatomy & Physiology I: Course Schedule and Key Topics Study Guide

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