Question 1

Which connective tissue layer directly surrounds each individual skeletal muscle fiber?

Accepted Answer

Endomysium

Question 2

A patient suffers a tear in the calcaneal (Achilles) tendon. Which type of connective tissue is primarily damaged?

Accepted Answer

Dense regular connective tissue

Question 3

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

Accepted Answer

They transmit action potentials deep into the muscle fiber.

Question 4

During muscle contraction, which protein forms cross-bridges with actin to shorten the sarcomere?

Accepted Answer

Myosin

Question 5

Which structure marks the boundary between adjacent sarcomeres in a myofibril?

Accepted Answer

Z disc

Question 6

A muscle contraction is initiated when the effort generated by the agonist exceeds the resistance. If the resistance is 50 N and the effort applied is 60 N, what is the net force causing movement?

Accepted Answer

$$10\ \mathrm{N}$$

Question 7

Which of the following is the correct sequence of connective tissue layers from the innermost to the outermost in a skeletal muscle?

Accepted Answer

Endomysium, Perimysium, Epimysium

Question 8

In the lever system of the forearm, which bone acts as the lever during flexion?

Accepted Answer

Radius

Question 9

Which of the following best describes the role of synergist muscles during a movement?

Accepted Answer

They assist the agonist and prevent undesirable movements.

Question 10

A muscle fiber is unable to contract because calcium ions are not released from the sarcoplasmic reticulum. Which structure is most likely malfunctioning?

Accepted Answer

Sarcoplasmic reticulum

Question 11

Which of the following is true regarding the A band in a sarcomere?

Accepted Answer

It is the length of the thick myofilament.

Question 12

If the biceps brachii is the agonist during forearm flexion, which muscle acts as the antagonist?

Accepted Answer

Triceps brachii

Question 13

Which protein connects thick myofilaments to the Z disc in a sarcomere?

Accepted Answer

Titin

Question 14

A patient has a mutation that prevents the formation of troponin. Which process would be directly affected?

Accepted Answer

The ability of myosin to bind to actin

Question 15

Which of the following best describes an aponeurosis?

Accepted Answer

A flat sheet of dense regular connective tissue

Question 16

During extension of the forearm, which muscle acts as the agonist?

Accepted Answer

Triceps brachii

Question 17

Which of the following is the correct description of the M line in a sarcomere?

Accepted Answer

It is where myosin tails (thick myofilaments) attach to each other.

Question 18

If a muscle's origin is on the scapula and its insertion is on the radius, which bone will move when the muscle contracts?

Accepted Answer

Radius

Question 19

Which of the following is a function of the perimysium?

Accepted Answer

Surrounds fascicles within skeletal muscle

Question 20

A muscle is unable to generate enough force to move a load. According to the lever system, which of the following is true?

Accepted Answer

The effort is less than the resistance.

Muscular System: Structure and Function

Study Guide - Practice Questions

Study Guide - Flashcards