Question 1

Which connective tissue layer surrounds individual muscle fibers within a skeletal muscle?

Accepted Answer

Endomysium

Question 2

Which type of muscle tissue is striated and involuntary?

Accepted Answer

Cardiac muscle

Question 3

A patient with Duchenne muscular dystrophy (DMD) is likely to experience muscle weakness due to a defect in which protein?

Accepted Answer

Dystrophin

Question 4

Which of the following best describes the 'all or none principle' of action potentials in muscle fibers?

Accepted Answer

A muscle fiber will contract only if the stimulus is above threshold, and the contraction is always maximal.

Question 5

During muscle contraction, which event directly allows myosin heads to bind to actin?

Accepted Answer

Removal of tropomyosin from actin binding sites due to calcium binding to troponin

Question 6

Which energy source is used first and depleted most rapidly during intense skeletal muscle activity?

Accepted Answer

Stored ATP

Question 7

A muscle contraction in which tension increases but the muscle does not change length is called:

Accepted Answer

Isometric contraction

Question 8

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

Accepted Answer

Pumping blood throughout the body

Question 9

What is the role of acetylcholinesterase at the neuromuscular junction?

Accepted Answer

It degrades acetylcholine, terminating the signal transmission.

Question 10

Which of the following best explains why muscle fibers require a rich blood supply?

Accepted Answer

To deliver oxygen and nutrients and remove waste products rapidly

Question 11

Which process is responsible for restoring the resting membrane potential after an action potential in a muscle fiber?

Accepted Answer

Action of the Na-K pump moving Na$$^+$$ out and K$$^+ in$$

Question 12

Which of the following is TRUE regarding the structure of a sarcomere?

Accepted Answer

It is the smallest contractile unit of a muscle fiber.

Question 13

Which of the following events occurs FIRST during excitation-contraction coupling in skeletal muscle?

Accepted Answer

Acetylcholine is released from the motor neuron

Question 14

Which type of muscle contraction occurs when you slowly lower a heavy object, such as a book, to the ground?

Accepted Answer

Eccentric isotonic contraction

Question 15

Which equation correctly represents the phosphorylation of ADP by creatine phosphate during muscle contraction?

Accepted Answer

$$\mathrm{ADP} + \mathrm{CP} \rightarrow \mathrm{ATP} + \mathrm{Creatine}$$

Question 16

A patient is unable to move a limb after nerve damage. Which process is most likely to occur in the affected muscle over time?

Accepted Answer

Atrophy

Question 17

Which of the following is a regulatory protein that binds calcium to initiate muscle contraction?

Accepted Answer

Troponin

Question 18

Which of the following statements about smooth muscle is correct?

Accepted Answer

It is non-striated and involuntary.

Question 19

Which of the following best describes the role of elastic filaments in the sarcomere?

Accepted Answer

They help the sarcomere recoil after tension is released.

Question 20

Which of the following is a direct attachment of muscle to bone?

Accepted Answer

Epimysium fused to periosteum

Nurs 1002-Obj #9

Study Guide - Practice Questions