Q: Which equation correctly represents the action of the sodium-potassium pump in maintaining membrane potential?

$$3 \mathrm{Na}^+_{\text{out}} + 2 \mathrm{K}^+_{\text{in}}$$

Q: Which equation represents the conversion of creatine phosphate and ADP to ATP during short bursts of muscle activity?

$$\text{Creatine~phosphate} + \text{ADP} \rightarrow \text{Creatine} + \text{ATP}$$

Question 1

Which type of muscle tissue is responsible for voluntary movement and is attached to bones?

Accepted Answer

Skeletal muscle

Question 2

What is the primary function of intercalated discs in cardiac muscle tissue?

Accepted Answer

To connect muscle fibers and allow synchronized contraction

Question 3

Which connective tissue layer surrounds an individual muscle fiber?

Accepted Answer

Endomysium

Question 4

During muscle contraction, which protein directly binds to the active site on actin?

Accepted Answer

Myosin

Question 5

A patient is experiencing muscle fatigue after intense exercise. Which metabolic process is primarily responsible for the rapid production of ATP under these conditions?

Accepted Answer

Glycolysis

Question 6

What is the role of the sarcoplasmic reticulum (SR) in muscle contraction?

Accepted Answer

It stores and releases calcium ions

Question 7

Which equation correctly represents the action of the sodium-potassium pump in maintaining membrane potential?

Accepted Answer

$$3 \mathrm{Na}^+_{	ext{out}} + 2 \mathrm{K}^+_{	ext{in}}$$

Question 8

Which structure is the functional unit of muscle contraction and is defined as the region between two Z lines?

Accepted Answer

Sarcomere

Question 9

A muscle twitch is recorded on a myogram. What is the period called between the stimulus and the onset of contraction?

Accepted Answer

Latent period

Question 10

Which of the following best describes the sliding filament theory of muscle contraction?

Accepted Answer

Thin filaments slide past thick filaments, increasing overlap and shortening the sarcomere

Question 11

What is the primary source of oxygen for aerobic respiration in muscle cells during moderate activity?

Accepted Answer

Hemoglobin and myoglobin

Question 12

Which process is responsible for the breakdown of acetylcholine (ACh) in the synaptic cleft, terminating muscle contraction?

Accepted Answer

Acetylcholinesterase activity

Question 13

If a muscle is unable to contract due to a drop in pH from lactic acid accumulation, which process is most likely impaired?

Accepted Answer

Cross-bridge cycling

Question 14

Which of the following is TRUE regarding muscle tone?

Accepted Answer

It is a sustained partial contraction that maintains posture

Question 15

During high-intensity training, which adaptation is most likely to occur in muscle cells?

Accepted Answer

Increase in glycolytic enzymes

Question 16

Which equation represents the conversion of creatine phosphate and ADP to ATP during short bursts of muscle activity?

Accepted Answer

$$	ext{Creatine~phosphate} + 	ext{ADP} ightarrow 	ext{Creatine} + 	ext{ATP}$$

Question 17

Which event directly triggers the release of calcium ions from the sarcoplasmic reticulum during excitation-contraction coupling?

Accepted Answer

Action potential traveling down the T-tubule

Question 18

A patient with a genetic defect in myosatellite cells would most likely have difficulty with which process?

Accepted Answer

Muscle fiber repair after injury

Question 19

Which of the following best explains why muscle fibers are multinucleate?

Accepted Answer

They form from the fusion of multiple myoblasts during development

Question 20

Which of the following is a correct sequence of events in the cross-bridge cycle?

Accepted Answer

Myosin binds to actin, pivots, releases ADP, binds ATP, detaches, and resets

Muscle Tissue: Structure, Function, and Development

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