Question 1

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

Accepted Answer

Ability to divide rapidly after injury

Question 2

A patient presents with muscle stiffness several hours after death. Which of the following best explains the physiological cause of rigor mortis?

Accepted Answer

Lack of ATP prevents detachment of myosin heads from actin

Question 3

Which connective tissue sheath directly surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 4

During the sliding filament model of contraction, which of the following statements is TRUE?

Accepted Answer

Thin filaments slide past thick filaments, increasing overlap

Question 5

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

Accepted Answer

It stores and releases $$\mathrm{Ca$$^{2+}$$}$$ ions

Question 6

A toxin blocks acetylcholinesterase at the neuromuscular junction. What is the most likely effect on muscle contraction?

Accepted Answer

Muscle contraction will be prolonged due to continued stimulation

Question 7

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

Accepted Answer

Action potential travels down T tubules

Question 8

Which structure is responsible for transmitting the action potential deep into the muscle fiber?

Accepted Answer

T tubules

Question 9

Which of the following is the correct sequence of events at the neuromuscular junction?

Accepted Answer

Action potential arrives → Ca$$^{2+}$$ enters axon terminal → ACh released → ACh binds to receptors

Question 10

Which of the following best describes the function of troponin in skeletal muscle contraction?

Accepted Answer

It binds calcium ions, causing a conformational change that moves tropomyosin

Question 11

A patient is unable to move their skeletal muscles voluntarily but their heart and digestive muscles function normally. Which muscle tissue is most likely affected?

Accepted Answer

Skeletal muscle

Question 12

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

Accepted Answer

Generating heat during contraction

Question 13

Which of the following best describes the role of ATP in the cross bridge cycle?

Accepted Answer

ATP binds to myosin, causing detachment from actin

Question 14

Which of the following is TRUE regarding the I band of a sarcomere during muscle contraction?

Accepted Answer

The I band shortens

Question 15

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

Question 16

Which of the following is the smallest contractile unit of a muscle fiber?

Accepted Answer

Sarcomere

Question 17

Which of the following is TRUE about the difference between direct and indirect muscle attachments?

Accepted Answer

Indirect attachments involve connective tissue extending as a tendon or aponeurosis

Question 18

Which of the following best describes the effect of a drug that blocks voltage-gated Na$$^+$$ channels in the sarcolemma?

Accepted Answer

It would prevent depolarization and inhibit muscle contraction

Question 19

Which of the following is a correct statement about the events that occur after an action potential reaches the axon terminal of a motor neuron?

Accepted Answer

Voltage-gated Ca$$^{2+}$$ channels open, causing Ca$$^{2+} to $$enter the axon terminal

Muscles and Muscle Tissue: Structure and Function

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