Question 1

Which of the following is a function unique to cardiac muscle tissue compared to skeletal and smooth muscle tissue?

Accepted Answer

Pumping blood throughout the heart via synchronized contractions

Question 2

Which structure in a muscle cell stores and releases calcium ions necessary for muscle contraction?

Accepted Answer

Sarcoplasmic reticulum (SR)

Question 3

A patient is unable to extend their muscle back to its original length after stretching. Which property of muscle cells is most likely impaired?

Accepted Answer

Elasticity

Question 4

Which of the following best describes the arrangement of myofibrils in smooth muscle cells compared to skeletal muscle cells?

Accepted Answer

Smooth muscle cells have a different myofibril arrangement than cardiac and skeletal muscle cells

Question 5

During muscle contraction, which protein binds to actin and pulls it toward the M line?

Accepted Answer

Myosin

Question 6

Which region of the sarcomere contains only thick filaments and is found in the middle of the A band?

Accepted Answer

H zone

Question 7

If a muscle cell loses its ability to respond to chemical or electrical signals, which property is most affected?

Accepted Answer

Excitability

Question 8

Which of the following structures serves as the anchoring point for thin filaments in the sarcomere?

Accepted Answer

Z disc

Question 9

A muscle cell is observed to have striations, multiple nuclei, and is attached to bone. Which type of muscle tissue is this?

Accepted Answer

Skeletal muscle

Question 10

Which of the following is a regulatory protein that blocks the active site on actin in a relaxed muscle?

Accepted Answer

Tropomyosin

Question 11

What is the primary function of the elastic filament (titin) in the sarcomere?

Accepted Answer

Stabilize the myofibril structure and maintain alignment

Question 12

Which of the following equations correctly represents the relationship between force ($F$), mass ($m$), and acceleration ($a$) in the context of muscle contraction?

Accepted Answer

$F = m 	imes a$

Question 13

Which type of muscle tissue is responsible for involuntary contractions that change the diameter of organs such as blood vessels and the pupil of the eye?

Accepted Answer

Smooth muscle

Question 14

Which of the following best describes the role of gap junctions in cardiac muscle tissue?

Accepted Answer

They allow for synchronized contraction by permitting electrical signals to pass between cells

Question 15

A muscle cell is observed to have a single nucleus, no striations, and is found in the wall of the stomach. Which type of muscle tissue is this?

Accepted Answer

Smooth muscle

Question 16

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

Accepted Answer

Producing hormones

Question 17

Which protein is found in the thick filament and has heads that bind to actin during muscle contraction?

Accepted Answer

Myosin

Question 18

Which of the following best explains why skeletal muscle contractions are considered voluntary?

Accepted Answer

They are controlled by conscious thought

Question 19

Which of the following correctly matches the muscle cell terminology to its definition?

Accepted Answer

Sarcolemma: muscle cell's plasma membrane

Question 20

Which of the following is the correct order of structures from largest to smallest in a skeletal muscle cell?

Accepted Answer

Muscle fiber, myofibril, sarcomere, thick filament

Muscle Tissue: Structure, Function, and Cellular Organization

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