Question 1

Which of the following best describes the primary function of skeletal muscles in the human body?

Accepted Answer

They enable voluntary movement of body parts and help maintain posture.

Question 2

During a bicep curl, which muscle acts as the agonist and which as the antagonist?

Accepted Answer

Biceps as agonist, triceps as antagonist

Question 3

Which type of muscle contraction occurs when you hold a plank position and your muscles do not change length?

Accepted Answer

Isometric

Question 4

What is the main difference between fast-twitch and slow-twitch muscle fibers?

Accepted Answer

Fast-twitch fibers contract quickly and are used for high-intensity, anaerobic activities.

Question 5

Which of the following is TRUE about cardiac muscle?

Accepted Answer

It contracts regularly and continuously without tiring.

Question 6

A marathon runner is likely to have a higher proportion of which type of muscle fiber in their legs?

Accepted Answer

Slow-twitch fibers

Question 7

Which of the following best explains why muscles work in pairs?

Accepted Answer

One muscle contracts to move a bone, and another contracts to return it to its original position.

Question 8

Which muscle is primarily responsible for straightening the arm at the elbow?

Accepted Answer

Triceps

Question 9

What happens to muscle stores of ATP and creatine phosphate during intense exercise?

Accepted Answer

They are used up to provide energy for muscle contraction.

Question 10

Which of the following statements about tendons and ligaments is correct?

Accepted Answer

Tendons join muscle to bone, ligaments join bone to bone.

Question 11

Which type of muscle contraction is occurring when you slowly lower a heavy object to the ground?

Accepted Answer

Isotonic eccentric

Question 12

Which of the following is a function of smooth muscle?

Accepted Answer

Moving food through the digestive tract

Question 13

If a person experiences muscle atrophy, what is happening to their muscles?

Accepted Answer

The muscles are decreasing in size.

Question 14

Which of the following best describes the role of synergist muscles during movement?

Accepted Answer

They stabilize the area around the prime mover and fine-tune movement.

Question 15

Which equation best represents the relationship between force, muscle contraction, and movement in isotonic contractions?

Accepted Answer

$$F = m 	imes a$$

Question 16

During exercise, which waste products build up in muscles and can lead to tiredness and cramp?

Accepted Answer

Carbon dioxide and lactic acid

Question 17

Which muscle group is primarily responsible for raising your arm sideways at the shoulder?

Accepted Answer

Deltoid

Question 18

A sprinter is most likely to have a higher percentage of which muscle fiber type?

Accepted Answer

Fast-twitch fibers

Question 19

Which of the following best explains why standing on your toes for a long time is tiring?

Accepted Answer

The gastrocnemius contains a high proportion of fast-twitch fibers.

Question 20

Which of the following is NOT a function of muscles in the human body?

Accepted Answer

Producing hormones

The Muscular System: Structure, Function, and Exercise

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