Question 1

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

Accepted Answer

Production of hormones

Question 2

Which type of muscle tissue is characterized by long, thin, striated, multinucleated cells arranged parallel to each other and is under voluntary control?

Accepted Answer

Skeletal muscle tissue

Question 3

Cardiac muscle tissue is unique because it contains which of the following structures that allow for coordinated contraction?

Accepted Answer

Intercalated discs

Question 4

Which property of muscle cells allows them to return to their original length after being stretched?

Accepted Answer

Elasticity

Question 5

A muscle cell’s plasma membrane is called the:

Accepted Answer

Sarcolemma

Question 6

Which of the following best describes the function of the sarcoplasmic reticulum (SR) in skeletal muscle fibers?

Accepted Answer

It stores and releases calcium ions.

Question 7

Which protein is responsible for the contractile function in thick filaments of muscle fibers?

Accepted Answer

Myosin

Question 8

Duchenne Muscular Dystrophy is caused by a defective gene for which protein?

Accepted Answer

Dystrophin

Question 9

During the sliding-filament mechanism of muscle contraction, which of the following occurs?

Accepted Answer

Thin filaments move toward the M line

Question 10

Which of the following best describes the resting membrane potential of a muscle cell?

Accepted Answer

The inside of the cell is more negative than the outside

Question 11

The sodium-potassium pump ($$Na^+/K^+$$ ATPase) moves ions in which direction and ratio?

Accepted Answer

3 $$Na^+$$ out, 2 $$K^+ in$$

Question 12

Which of the following is TRUE regarding the generation of the resting membrane potential in muscle fibers?

Accepted Answer

Potassium ions diffuse through leak channels more easily than sodium ions.

Question 13

During an action potential, what is the sequence of ion channel activity?

Accepted Answer

Voltage-gated sodium channels open first, then voltage-gated potassium channels

Question 14

What is the role of acetylcholinesterase (AChE) at the neuromuscular junction?

Accepted Answer

It degrades and inactivates acetylcholine in the synaptic cleft.

Question 15

Which of the following best describes the function of the motor end plate?

Accepted Answer

It contains receptors for acetylcholine.

Question 16

Which of the following events occurs first during the excitation phase of skeletal muscle contraction?

Accepted Answer

An action potential arrives at the axon terminal.

Question 17

Which of the following is a correct statement about the structure of a sarcomere?

Accepted Answer

The H zone contains only thick filaments.

Question 18

Which of the following best explains why the inside of a resting muscle cell is negative relative to the outside?

Accepted Answer

More potassium ions leave the cell than sodium ions enter.

Question 19

Which of the following is a property shared by all three types of muscle tissue?

Accepted Answer

They all generate muscle tension.

Muscle Tissue: Structure, Types, and Functions

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