$$F_{transmitted} = F_{fiber} \times (E_{epimysium} + E_{perimysium} + E_{endomysium})$$

Question 1

Which of the following is a unique property of skeletal muscle tissue that distinguishes it from cardiac and smooth muscle tissue?

Accepted Answer

It is striated and contracts voluntarily.

Question 2

A patient presents with muscle weakness and delayed relaxation after contraction. Which muscular disorder is most likely responsible?

Accepted Answer

Myotonic dystrophy

Question 3

Which connective tissue layer surrounds each individual muscle fiber?

Accepted Answer

Endomysium

Question 4

During muscle contraction, which band remains unchanged according to the sliding filament theory?

Accepted Answer

A band

Question 5

Which structure in a muscle fiber is responsible for releasing calcium ions to initiate contraction?

Accepted Answer

Sarcoplasmic reticulum

Question 6

A sprinter relies on rapid, powerful muscle contractions. Which muscle fiber type predominates in their leg muscles?

Accepted Answer

Fast glycolytic fibers

Question 7

Which term refers to the plasma membrane of a muscle cell?

Accepted Answer

Sarcolemma

Question 8

What is the primary function of titin in the sarcomere?

Accepted Answer

Holds thick filaments in place and resists overstretching

Question 9

Which equation best represents the relationship between force transmission and connective tissue layers in skeletal muscle?

Accepted Answer

$$F_{transmitted} = F_{fiber} 	imes (E_{epimysium} + E_{perimysium} + E_{endomysium})$$

Question 10

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

Accepted Answer

It is the site where a motor neuron communicates with a muscle fiber.

Question 11

A muscle attaches to bone via a tendon. This type of attachment is classified as:

Accepted Answer

Indirect attachment

Question 12

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

Accepted Answer

Synthesis of hormones

Question 13

Which band in the sarcomere contains only thin filaments?

Accepted Answer

I band

Question 14

Which of the following best explains why skeletal muscle fibers are multinucleated?

Accepted Answer

They are formed by fusion of embryonic cells.

Question 15

Aging leads to sarcopenia, which is characterized by:

Accepted Answer

Muscle wasting and strength drop by about 50% by age 80

Question 16

Which of the following is true regarding the arrangement of thick and thin filaments in the sarcomere?

Accepted Answer

Thin filaments extend from the Z disc toward the center.

Question 17

Which muscle fiber type is most resistant to fatigue and relies primarily on aerobic metabolism?

Accepted Answer

Slow oxidative fibers

Question 18

Which of the following best describes the function of T tubules in skeletal muscle fibers?

Accepted Answer

Coordinate signal transmission and form triads with cisterns

Question 19

If a muscle loses its ability to recoil after stretching, which property has been compromised?

Accepted Answer

Elasticity

Question 20

A patient with Duchenne muscular dystrophy is most likely to have a mutation in a gene located on which chromosome?

Accepted Answer

X chromosome

Skeletal Muscle Tissue: Structure, Function, and Physiology

Guida di studio - Domande di pratica