Q: Which of the following is the correct equation for ATP regeneration by creatine phosphate?

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

Question 1

Which of the following is a unique feature of cardiac muscle tissue compared to skeletal and smooth muscle?

Accepted Answer

It contracts at a steady rate due to its own pacemaker

Question 2

Which connective tissue sheath directly surrounds an individual muscle fiber?

Accepted Answer

Endomysium

Question 3

During the sliding filament model of muscle contraction, which structural change occurs within the sarcomere?

Accepted Answer

I bands shorten

Question 4

A patient develops a condition where skeletal muscle shows uncontrolled calcium release from the sarcoplasmic reticulum. What is the direct consequence of excessive calcium release?

Accepted Answer

Sustained cross-bridge cycling and muscle rigidity

Question 5

A patient presents with sustained muscle spasms after exposure to a toxin that inhibits acetylcholinesterase. What is the direct effect at the muscle fiber?

Accepted Answer

Continuous stimulation by acetylcholine

Question 6

Which protein directly blocks myosin-binding sites on actin in a relaxed muscle?

Accepted Answer

Tropomyosin

Question 7

A 22-year-old sprinter collapses after a 100m dash. Which muscle fibers are primarily recruited during this activity?

Accepted Answer

Fast glycolytic

Question 8

A 34-year-old marathon runner complains of muscle fatigue during long runs. Laboratory tests show normal ATP levels but increased inorganic phosphate (Pi). What is the most likely cause of this athlete's reduced muscle performance?

Accepted Answer

Interference with calcium release from SR

Question 9

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

Accepted Answer

Voluntary control

Question 10

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

Accepted Answer

Efflux of $$K^{+}$$ through voltage-gated channels

Question 11

Which of the following best describes the role of the sodium-potassium pump in muscle cells?

Accepted Answer

It pumps 3 $$Na^{+}$$ out and 2 $$K^{+} in$$, maintaining the resting membrane potential

Question 12

Which metabolic pathway is directly impaired when muscle glycogen stores are depleted?

Accepted Answer

Anaerobic glycolysis

Question 13

A muscle biopsy reveals fibers with high myoglobin and mitochondria content. Which activity would these fibers best support?

Accepted Answer

Marathon running

Question 14

Which of the following events occurs during the contraction period of a muscle twitch?

Accepted Answer

Crossbridge cycling increases tension

Question 15

Which ion is most responsible for triggering muscle contraction by binding to troponin?

Accepted Answer

$$Ca^{2+}$$

Question 16

Which type of muscle contraction results in a smooth, sustained plateau of tension with no relaxation?

Accepted Answer

Fused (complete) tetanus

Question 17

Which of the following is a direct effect of increased stimulus frequency on muscle contraction?

Accepted Answer

Increased muscle tension due to wave summation

Question 18

Which of the following is the correct equation for ATP regeneration by creatine phosphate?

Accepted Answer

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

Question 19

Which muscle fiber type is most likely to be depleted in a patient with reduced endurance and difficulty sustaining repeated contractions?

Accepted Answer

Slow oxidative fibers

Question 20

Which step in excitation-contraction coupling is directly affected in myasthenia gravis?

Accepted Answer

Acetylcholine receptor function

Muscle Tissue: Structure, Types, and Characteristics

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