Question 1

Which connective tissue layer directly surrounds each individual skeletal muscle fiber?

Accepted Answer

Endomysium

Question 2

A patient presents with difficulty closing their eyes. Which muscle is most likely affected?

Accepted Answer

Orbicularis Oculi

Question 3

Which muscle is the prime mover for protraction of the scapula?

Accepted Answer

Serratus Anterior

Question 4

During inhalation, which muscle contracts to increase the volume of the thoracic cavity?

Accepted Answer

Diaphragm

Question 5

If the biceps brachii is the agonist for elbow flexion, which muscle acts as the antagonist?

Accepted Answer

Triceps Brachii

Question 6

Which muscle group is responsible for extension of the knee?

Accepted Answer

Quadriceps Group

Question 7

A muscle that stabilizes a bone during movement, preventing unwanted motion, is called a:

Accepted Answer

Fixator

Question 8

Which muscle is primarily responsible for abduction of the arm at the shoulder?

Accepted Answer

Deltoid

Question 9

A patient has difficulty flexing their thigh and laterally bending their vertebral column. Which muscle is most likely injured?

Accepted Answer

Psoas Major

Question 10

Which muscle assists with smiling by raising the corners of the mouth?

Accepted Answer

Zygomaticus Major

Question 11

If a muscle has fascicles that feather out at an angle from only one side of the tendon, it is classified as:

Accepted Answer

Unipennate

Question 12

Which muscle is responsible for plantar flexion of the foot and assists with flexing the knee?

Accepted Answer

Gastrocnemius

Question 13

Which muscle group is located on the posterior aspect of the thigh and is responsible for extension of the thigh and flexion of the knee?

Accepted Answer

Hamstring Group

Question 14

A muscle that causes the same movement as the agonist but does not produce as much force is called a:

Accepted Answer

Synergist

Question 15

Which muscle is responsible for flexion of the trunk and compression of the abdominal cavity?

Accepted Answer

Rectus Abdominis

Question 16

Which muscle attaches the zygomatic arch to the angle of the mandible and elevates the jaw?

Accepted Answer

Masseter

Question 17

A patient is unable to extend their fingers and wrist. Which muscle is most likely damaged?

Accepted Answer

Extensor Digitorum

Question 18

Which muscle connects the lateral condyle and upper diaphysis of the tibia to the cuneiform and first metatarsal, and is responsible for dorsiflexion and inversion of the foot?

Accepted Answer

Tibialis Anterior

Question 19

Which muscle is responsible for lateral rotation of the humerus and stabilization of the shoulder joint?

Accepted Answer

Infraspinatus

Question 20

If the diaphragm contracts and lowers the floor of the thoracic cavity, what happens to the pressure inside the thoracic cavity according to Boyle's Law ($$P_1V_1 = P_2V_2$$)?

Accepted Answer

Pressure decreases as volume increases

Chapter 9: The Muscular System – Structure, Organization, and Major Muscles

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