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

Question 1

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

Accepted Answer

Producing hormones to regulate metabolism

Question 2

What is the correct order of connective tissue layers from the outermost to the innermost in a skeletal muscle?

Accepted Answer

Epimysium, Perimysium, Endomysium

Question 3

A muscle fiber is directly covered by which connective tissue layer?

Accepted Answer

Endomysium

Question 4

Which structure allows electrical impulses to travel deep into the muscle fiber, ensuring coordinated contraction?

Accepted Answer

Transverse tubules (T tubules)

Question 5

During muscle contraction, which theory explains the movement of actin and myosin filaments?

Accepted Answer

Sliding filament theory

Question 6

Which equation correctly represents the reaction for energy storage in muscle cells involving creatine phosphate?

Accepted Answer

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

Question 7

Which phase of a muscle twitch is characterized by the release of calcium ions and the formation of cross-bridges?

Accepted Answer

Contraction phase

Question 8

A patient is unable to move their arm after a cast is removed. Which process best explains the decrease in muscle size and strength?

Accepted Answer

Atrophy

Question 9

Which type of muscle fiber is most resistant to fatigue and why?

Accepted Answer

Slow-twitch fibers, because they have extensive capillary networks and high myoglobin

Question 10

Which of the following best describes an isometric contraction?

Accepted Answer

The muscle length stays the same while tension is produced

Question 11

What is the role of the motor unit in skeletal muscle contraction?

Accepted Answer

It is a single motor neuron and all the muscle fibers it controls

Question 12

Which process is responsible for the majority of ATP production during moderate, sustained muscle activity?

Accepted Answer

Aerobic metabolism in mitochondria

Question 13

Which muscle is the prime mover (agonist) for flexion of the forearm at the elbow?

Accepted Answer

Biceps brachii

Question 14

Which of the following statements about cardiac muscle tissue is TRUE?

Accepted Answer

Cardiac muscle cells contract without neural stimulation due to pacemaker cells

Question 15

Which muscle group is responsible for extension of the knee joint?

Accepted Answer

Quadriceps femoris

Question 16

Which of the following is a synergist muscle that assists the biceps brachii in flexion at the elbow?

Accepted Answer

Brachialis

Question 17

Which muscle is primarily responsible for plantar flexion of the foot?

Accepted Answer

Gastrocnemius

Question 18

Which of the following best describes the arrangement of thick and thin filaments in a relaxed sarcomere?

Accepted Answer

Only thick filaments are present in the H band

Question 19

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

Accepted Answer

Lifting a book from a table

Question 20

Which muscle is part of the rotator cuff and is commonly injured in athletes?

Accepted Answer

Supraspinatus

Muscular System: Structure and Function

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