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

Question 1

Which of the following best describes the primary function of muscle tissue in the human body?

Accepted Answer

To transform chemical energy (ATP) into directed mechanical energy capable of exerting force

Question 2

Which connective tissue sheath directly surrounds individual skeletal muscle fibers?

Accepted Answer

Endomysium

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

During muscle contraction, which event occurs according to the sliding filament model?

Accepted Answer

Thin filaments slide past thick filaments, increasing overlap without changing filament length

Question 5

Which of the following is TRUE regarding the neuromuscular junction?

Accepted Answer

It is the site where the axon terminal of a motor neuron communicates with the muscle fiber via acetylcholine

Question 6

Which ion is primarily responsible for depolarizing the sarcolemma during the generation of an action potential?

Accepted Answer

Na$$^{+}$$

Question 7

What is the role of acetylcholinesterase at the neuromuscular junction?

Accepted Answer

It degrades acetylcholine in the synaptic cleft, terminating the signal

Question 8

Which of the following best describes the cross bridge cycle during muscle contraction?

Accepted Answer

ATP binds to myosin head, causing detachment from actin, and hydrolysis of ATP cocks the myosin head

Question 9

Which of the following is a characteristic unique to cardiac muscle tissue?

Accepted Answer

It is striated and involuntary

Question 10

A muscle twitch consists of three phases. Which phase corresponds to the time when Ca$$^{2+} is re-$$entering the sarcoplasmic reticulum?

Accepted Answer

Period of relaxation

Question 11

Which equation represents the direct phosphorylation of ADP by creatine phosphate in muscle cells?

Accepted Answer

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

Question 12

Which muscle fiber type is best suited for endurance activities such as marathon running?

Accepted Answer

Slow oxidative fibers

Question 13

In a scenario where a person is holding a heavy box without moving, which type of muscle contraction is occurring?

Accepted Answer

Isometric contraction

Question 14

Which of the following factors does NOT increase the force of skeletal muscle contraction?

Accepted Answer

Decreasing the size of muscle fibers

Question 15

During anaerobic glycolysis, what is the fate of pyruvate when oxygen is unavailable?

Accepted Answer

It is converted to lactate

Question 16

Which of the following best explains muscle fatigue during prolonged exercise?

Accepted Answer

Ionic imbalances and increased inorganic phosphate interfering with calcium release and power generation

Question 17

Which process is responsible for restoring ionic conditions after repolarization in a muscle fiber?

Accepted Answer

Active transport by the Na$$^{+}/K$^{+}$$ pump

Question 18

Which statement about motor units is correct?

Accepted Answer

Smaller motor units allow for greater fine control of muscle movement

Question 19

Which of the following is a real-life example of an eccentric isotonic contraction?

Accepted Answer

Laying a book down, causing the biceps to lengthen while generating force

Question 20

Which equation best represents aerobic respiration in muscle cells?

Accepted Answer

$$	ext{Glucose} + 6	ext{O}_2 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O} + 32	ext{ATP}$$

Muscles and Muscle Tissue: Structure, Function, and Physiology

Study Guide - Practice Questions