Question 1

Which of the following best describes the function of the endomysium in skeletal muscle tissue?

Accepted Answer

It surrounds each individual muscle fiber and holds muscle cells together within the tissue.

Question 2

A patient suffers a heart attack that damages the intercalated discs of cardiac muscle. Which of the following consequences is most likely?

Accepted Answer

The heart muscle cells will lose their ability to communicate and contract in a coordinated fashion.

Question 3

Which of the following is TRUE regarding the arrangement of myofilaments in a sarcomere?

Accepted Answer

Elastic filaments run through the core of the thick filament and attach to the Z-disc.

Question 4

During muscle contraction, which of the following changes occur in the sarcomere?

Accepted Answer

The I band shortens and the H zone disappears.

Question 5

Which protein directly blocks the myosin-binding sites on actin in a relaxed skeletal muscle fiber?

Accepted Answer

Tropomyosin

Question 6

A muscle biopsy reveals long, multinucleated, striated fibers with nuclei located on the inner surface of the sarcolemma. Which type of muscle tissue is this?

Accepted Answer

Skeletal muscle

Question 7

Which of the following best explains why skeletal muscle fibers contain multiple nuclei?

Accepted Answer

They arise from the fusion of multiple embryonic myoblasts.

Question 8

Which structure in skeletal muscle fibers is responsible for conducting action potentials deep into the cell?

Accepted Answer

Transverse tubules (T-tubules)

Question 9

A patient is diagnosed with a genetic defect in the titin protein. Which of the following symptoms would most likely be observed?

Accepted Answer

Muscle fibers lose their elasticity and are easily overstretched.

Question 10

Which of the following is a key difference between smooth muscle and skeletal muscle?

Accepted Answer

Smooth muscle lacks troponin and has more thin filaments than thick filaments.

Question 11

Which of the following best describes the role of the sarcoplasmic reticulum in muscle contraction?

Accepted Answer

It stores and releases calcium ions necessary for contraction.

Question 12

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 13

Which of the following statements about cardiac muscle is correct?

Accepted Answer

It contains intercalated discs and is under involuntary control.

Question 14

Which of the following best explains why smooth muscle can maintain contraction for long periods with minimal energy expenditure?

Accepted Answer

Smooth muscle filaments are arranged obliquely and anchored to dense bodies, allowing for slow, sustained contractions.

Question 15

Which of the following is the functional unit of contraction in a skeletal muscle fiber?

Accepted Answer

Sarcomere

Question 16

A muscle injury damages the perimysium. Which of the following structures is most directly affected?

Accepted Answer

Bundles of muscle fibers (fascicles)

Question 17

Which of the following best describes the arrangement of thick and thin filaments in the A band of a sarcomere?

Accepted Answer

Both thick and thin filaments overlap.

Question 18

Which of the following is a unique feature of cardiac muscle cells compared to skeletal muscle cells?

Accepted Answer

Presence of intercalated discs for cell-to-cell communication.

Question 19

Which of the following best explains the role of gap junctions in smooth muscle tissue?

Accepted Answer

They allow for rapid communication and coordinated contraction between adjacent cells.

Muscle Tissue and Muscle Cell Structure: An Overview

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