Question 1

Which connective tissue layer directly surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 2

A fascicle is best described as a bundle of which of the following?

Accepted Answer

Muscle fibers

Question 3

The plasma membrane of a muscle fiber is called the ______ and it wraps bundles of ______.

Accepted Answer

Sarcolemma; myofibrils

Question 4

Which of the following is the smallest contractile unit of a muscle?

Accepted Answer

Sarcomere

Question 5

Arrange the following structures from superficial to deep in a skeletal muscle: Myofilaments, Epimysium, Perimysium, Endomysium, Sarcolemma, Fascicle, Myofibrils.

Accepted Answer

Epimysium → Perimysium → Fascicle → Endomysium → Sarcolemma → Myofibrils → Myofilaments

Question 6

In the context of beef marbling, which connective tissue layer is most likely to contain excess fat in highly marbled meat such as Kobe beef?

Accepted Answer

Perimysium

Question 7

Which structure is responsible for storing and releasing calcium ions in muscle fibers?

Accepted Answer

Sarcoplasmic reticulum

Question 8

What is the primary function of T-tubules in skeletal muscle fibers?

Accepted Answer

Transmit action potentials deep into the muscle fiber

Question 9

Which protein is NOT a major component of myofibrils?

Accepted Answer

Collagen

Question 10

If a muscle fiber is unable to contract, which structure is most likely malfunctioning?

Accepted Answer

Sarcomere

Question 11

Which equation best represents the relationship between force ($$F$$), cross-sectional area ($$A$$), and muscle tension ($$T) in $$skeletal muscle?

Accepted Answer

$$F = T 	imes A$$

Question 12

A patient has a genetic defect affecting the sarcolemma. Which of the following symptoms would most likely result?

Accepted Answer

Difficulty transmitting action potentials into the muscle fiber

Question 13

Which connective tissue layer is continuous with tendons, allowing force transmission from muscle to bone?

Accepted Answer

Epimysium

Question 14

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

Accepted Answer

They contain the contractile proteins actin and myosin

Question 15

During muscle contraction, which event occurs first?

Accepted Answer

Transmission of action potential along the sarcolemma

Question 16

Which of the following is TRUE regarding the organization of muscle tissue?

Accepted Answer

A muscle is made up of bundles of fascicles, which are surrounded by epimysium.

Question 17

If the perimysium is damaged, which of the following is most likely to be affected?

Accepted Answer

Organization and separation of fascicles within the muscle

Question 18

Which structure is most analogous to a rope in its function of connecting muscle to bone?

Accepted Answer

Tendon

Question 19

A muscle cell is also known as a:

Accepted Answer

Muscle fiber

Question 20

Which of the following best explains why marbling in beef improves flavor and tenderness?

Accepted Answer

Fat stored in the perimysium increases moisture and flavor during cooking

Organization and Structure of Skeletal Muscle Tissue

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