Question 1

Which of the following is NOT a characteristic shared by all muscle tissue types?

Accepted Answer

Striations

Question 2

A patient is diagnosed with Duchenne muscular dystrophy (DMD). Which protein is defective, leading to the symptoms observed in this disease?

Accepted Answer

Dystrophin

Question 3

Which muscle tissue type is responsible for pumping blood throughout the body and is characterized by striations and involuntary control?

Accepted Answer

Cardiac muscle

Question 4

During a muscle contraction, which structure serves as the functional unit of a skeletal muscle fiber?

Accepted Answer

Sarcomere

Question 5

Which connective tissue sheath surrounds an individual muscle fiber?

Accepted Answer

Endomysium

Question 6

A muscle is attached to a bone via a ropelike structure. This type of attachment is best described as:

Accepted Answer

Indirect attachment via tendon

Question 7

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

Accepted Answer

Thick filaments are connected at the M line and surrounded by six thin filaments anchored to Z discs.

Question 8

Which of the following is a function of skeletal muscle tissue?

Accepted Answer

Generating heat

Question 9

A muscle fiber is stimulated to contract. Which structure allows the electrical signal to penetrate deep into the cell, ensuring a coordinated contraction?

Accepted Answer

T tubules

Question 10

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

Accepted Answer

They are formed by the fusion of multiple embryonic cells called myoblasts.

Question 11

A patient presents with muscle weakness and frequent falls. Genetic testing reveals a mutation in a protein that links thin filaments to the extracellular matrix. Which process is most directly affected?

Accepted Answer

Stabilization of the sarcolemma

Question 12

Which of the following statements about the sarcoplasmic reticulum (SR) is correct?

Accepted Answer

It is a network of smooth endoplasmic reticulum that regulates intracellular $$\mathrm{Ca$$^{2+}$$}$$ levels.

Question 13

Which of the following best describes the role of myoglobin in skeletal muscle fibers?

Accepted Answer

It stores oxygen for use during muscle contraction.

Question 14

During the sliding filament model of muscle contraction, which event occurs first?

Accepted Answer

Calcium ions are released from the sarcoplasmic reticulum.

Question 15

Which of the following is a regulatory protein bound to actin in thin filaments?

Accepted Answer

Both tropomyosin and troponin

Question 16

A muscle biopsy reveals single, spindle-shaped, uninucleate cells with no striations. Which muscle type is this?

Accepted Answer

Smooth muscle

Question 17

Which of the following best describes the triad in skeletal muscle fibers?

Accepted Answer

One T tubule and two terminal cisterns

Question 18

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

Accepted Answer

Epimysium, perimysium, endomysium

Question 19

Which of the following is a real-life example of the function of smooth muscle tissue?

Accepted Answer

Moving food through the intestines via peristalsis

Question 20

A researcher is studying the effect of a drug that blocks the voltage sensors in the T tubule membrane. What is the most likely consequence for muscle contraction?

Accepted Answer

Calcium channels in the sarcoplasmic reticulum will remain closed, preventing contraction.

Muscles and Muscle Tissue: Structure and Function

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