Question 1

Which property of muscle tissue allows a muscle to return to its original resting length after being stretched?

Accepted Answer

Elasticity

Question 2

A patient is unable to produce movement in their forearm after a traumatic injury. Which function of skeletal muscle is most directly affected?

Accepted Answer

Producing movement

Question 3

During muscle contraction, which band in the sarcomere remains unchanged?

Accepted Answer

A band

Question 4

Which neurotransmitter is released at the neuromuscular junction to initiate muscle contraction?

Accepted Answer

Acetylcholine

Question 5

A muscle fiber is stimulated repeatedly before it can fully relax, resulting in increased tension. What is this phenomenon called?

Accepted Answer

Wave summation

Question 6

Which type of muscle contraction occurs when the muscle generates tension but does not change length?

Accepted Answer

Isometric contraction

Question 7

A marathon runner has a high proportion of muscle fibers that are slow to fatigue and contain abundant mitochondria. Which fiber type predominates in their muscles?

Accepted Answer

Type I (slow oxidative)

Question 8

Which structure stores and releases calcium ions during skeletal muscle contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 9

What is the correct sequence of events in skeletal muscle contraction?

Accepted Answer

Excitation, excitation-contraction coupling, contraction

Question 10

Which equation best represents the resting membrane potential of a muscle cell?

Accepted Answer

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

Question 11

A patient presents with muscle rigidity several hours after death. Which process is responsible for this phenomenon?

Accepted Answer

Rigor mortis

Question 12

Which muscle tissue type is characterized by striations, a single nucleus per cell, and intercalated disks?

Accepted Answer

Cardiac muscle

Question 13

If the palmaris longus muscle is absent, which function might be slightly compromised?

Accepted Answer

Flexion of the wrist

Question 14

Which protein directly blocks the myosin binding sites on actin in a resting muscle?

Accepted Answer

Tropomyosin

Question 15

During the excitation phase of muscle contraction, what is the role of acetylcholine?

Accepted Answer

It depolarizes the sarcolemma to initiate an action potential.

Question 16

Which of the following best describes the difference between isotonic and isometric contractions?

Accepted Answer

Isotonic contractions change muscle length; isometric contractions do not.

Question 17

A sprinter relies on muscle fibers that contract quickly but fatigue rapidly. Which fiber type is most prevalent in their muscles?

Accepted Answer

Type II (fast glycolytic)

Question 18

Which process must occur to repay the oxygen debt after intense exercise?

Accepted Answer

Restoration of ATP and creatine phosphate levels

Question 19

Which equation describes the force generated by a muscle during contraction?

Accepted Answer

$$F = \sigma \cdot A$$

Question 20

Aging affects skeletal muscle in all the following ways EXCEPT:

Accepted Answer

Increased density of capillaries

Muscle Tissue & Physiology: Structure, Function, and Attachments

Guida di studio - Domande di pratica

Study guide - Flashcard