Question 1

Which structure is responsible for transmitting electrical impulses between cardiac muscle cells, allowing for synchronized contraction?

Accepted Answer

Intercalated discs

Question 2

A patient presents with difficulty chewing due to muscle weakness. Which muscle is most likely affected?

Accepted Answer

Masseter

Question 3

In a cross-section of skeletal muscle, which connective tissue layer surrounds individual muscle fibers?

Accepted Answer

Endomysium

Question 4

Which muscle is primarily responsible for flexing the forearm at the elbow joint?

Accepted Answer

Brachialis

Question 5

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

Accepted Answer

External intercostals

Question 6

Which muscle is involved in abduction of the arm at the shoulder joint?

Accepted Answer

Deltoid

Question 7

A runner experiences pain along the lateral side of the thigh. Which structure is most likely involved?

Accepted Answer

Fascia lata (iliotibial band/tract)

Question 8

Which muscle is responsible for plantar flexion of the foot?

Accepted Answer

Gastrocnemius

Question 9

Which layer of smooth muscle in the small intestine is responsible for shortening the length of the organ during peristalsis?

Accepted Answer

Longitudinal layer

Question 10

Which band in the sarcomere contains only thin filaments and is shortened during muscle contraction?

Accepted Answer

I-band

Question 11

A patient is unable to raise their eyebrows. Which muscle is most likely paralyzed?

Accepted Answer

Frontalis

Question 12

Which muscle is responsible for flexion of the thigh at the hip joint and is deep to the pelvis?

Accepted Answer

Psoas major

Question 13

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

Accepted Answer

Quadriceps femoris

Question 14

Which muscle is involved in flexion of the fingers and is located in the anterior forearm?

Accepted Answer

Flexor digitorum

Question 15

Which structure at the neuromuscular junction is responsible for releasing neurotransmitters to stimulate muscle contraction?

Accepted Answer

Axon terminal

Question 16

A patient has difficulty abducting their fifth digit. Which muscle is most likely affected?

Accepted Answer

Abductor digiti minimi

Question 17

Which muscle is responsible for lateral rotation of the arm at the shoulder joint?

Accepted Answer

Infraspinatus

Question 18

Which muscle is most active during forced exhalation?

Accepted Answer

Internal intercostals

Question 19

Which muscle is responsible for flexion of the wrist and is located on the medial side of the forearm?

Accepted Answer

Flexor carpi ulnaris

Question 20

A patient presents with weakness in dorsiflexion of the foot. Which muscle is most likely affected?

Accepted Answer

Tibialis anterior

Muscle Histology and Major Muscles of the Human Body

Study Guide - Practice Questions