Question 1

Which statement best describes the role of the origin and insertion in skeletal muscle movement?

Accepted Answer

Origin is the closest to the trunk or more stationary bone, while insertion is more distal or more mobile.

Question 2

During flexion of the forearm, which muscle contracts and which relaxes?

Accepted Answer

Biceps contracts, triceps relaxes.

Question 3

Which type of muscle fiber is multinucleated and striated under the microscope?

Accepted Answer

Skeletal muscle fiber

Question 4

What is the primary function of antagonistic muscle groups?

Accepted Answer

To produce both flexion and extension movements

Question 5

Which structure is unique to cardiac muscle fibers and allows for coordinated contraction?

Accepted Answer

Intercalated disks

Question 6

If a patient is unable to extend their arm at the elbow, which muscle is most likely impaired?

Accepted Answer

Triceps brachii

Question 7

Which muscle type is responsible for voluntary movements such as walking?

Accepted Answer

Skeletal muscle

Question 8

Which of the following best describes the difference between flexion and extension?

Accepted Answer

Flexion brings bones closer together; extension moves bones away from each other.

Question 9

Which muscle type is characterized by small, spindle-shaped fibers without striations?

Accepted Answer

Smooth muscle

Question 10

A patient presents with muscle weakness and inability to perform flexion at the elbow. Which muscle is most likely affected?

Accepted Answer

Biceps brachii

Question 11

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

Accepted Answer

Pumping blood throughout the body

Question 12

Which muscle type is under involuntary control and found in the walls of hollow organs?

Accepted Answer

Smooth muscle

Question 13

Which of the following statements about muscle fibers is correct?

Accepted Answer

Skeletal muscle fibers are multinucleated and striated.

Question 14

Which anatomical feature is shared by both skeletal and cardiac muscle fibers but not by smooth muscle fibers?

Accepted Answer

Striations

Question 15

Which muscle type is responsible for the rhythmic contractions of the heart?

Accepted Answer

Cardiac muscle

Ch 12 A Muscle Structure and Function: An Introduction to Human Physiology

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