Question 1

Which of the following is NOT a major function of muscle tissue?

Accepted Answer

Producing hormones

Question 2

All muscle cells share certain structural elements. Which of the following is a property common to all types of muscle cells?

Accepted Answer

Ability to contract in response to electrical stimulation

Question 3

Which statement best describes the difference between skeletal and cardiac muscle tissue?

Accepted Answer

Skeletal muscle is voluntary, while cardiac muscle is involuntary

Question 4

Which protein is responsible for the contractile function in the sarcomere?

Accepted Answer

Myosin

Question 5

The sliding-filament mechanism of muscle contraction involves:

Accepted Answer

Actin and myosin filaments sliding past each other

Question 6

Which equation best represents the generation of resting membrane potential in skeletal muscle fibers?

Accepted Answer

$$ V_m = \frac{RT}{F} \ln \left( \frac{P_{K^+}[K^+]_{out} + P_{Na^+}[Na^+]_{out}}{P_{K^+}[K^+]_{in} + P_{Na^+}[Na^+]_{in}} \right) $$

Question 7

During an action potential in a skeletal muscle fiber, which event occurs first?

Accepted Answer

Acetylcholine binding to receptors at the neuromuscular junction

Question 8

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

Accepted Answer

It transmits the action potential from the neuron to the muscle fiber

Question 9

Excitation-contraction coupling in skeletal muscle involves:

Accepted Answer

Release of calcium ions from the sarcoplasmic reticulum

Question 10

Which immediate energy source is available to muscle fibers during the first few seconds of contraction?

Accepted Answer

Creatine phosphate

Question 11

Which equation represents the glycolytic pathway for ATP production in muscle fibers?

Accepted Answer

$$ C_6H_{12}O_6$ + 2 ADP + 2 P_i \rightarrow 2 C_3H_6O_3 + 2 ATP $$

Question 12

Which ATP source can fuel muscle activity for the longest duration?

Accepted Answer

Oxidative phosphorylation

Question 13

A motor unit consists of:

Accepted Answer

A single motor neuron and all the muscle fibers it innervates

Question 14

Endurance training primarily results in which adaptation in skeletal muscle?

Accepted Answer

Increased mitochondrial density

Question 15

Resistance training differs from endurance training in that it:

Accepted Answer

Promotes hypertrophy of muscle fibers

Question 16

Which of the following is a structural feature unique to cardiac muscle tissue?

Accepted Answer

Intercalated discs

Question 17

Smooth muscle contraction differs from skeletal muscle contraction in that smooth muscle:

Accepted Answer

Uses calmodulin instead of troponin for calcium binding

Question 18

Which of the following best describes the location of smooth muscle tissue?

Accepted Answer

Walls of hollow organs

Question 19

During muscle fiber relaxation, which event occurs?

Accepted Answer

Calcium ions are pumped back into the sarcoplasmic reticulum

Question 20

Which structural protein helps maintain the alignment of thick filaments in the sarcomere?

Accepted Answer

Titin

Muscle Tissue and Physiology: Structure, Function, and Mechanisms

Study Guide - Practice Questions