Question 1

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

Accepted Answer

brachialis

Question 2

A patient presents with difficulty elevating their scapula and bending their neck laterally. Which muscle is most likely affected?

Accepted Answer

levator scapulae

Question 3

If the external intercostal muscles are paralyzed, which physiological process would be most directly impaired?

Accepted Answer

Inspiration

Question 4

Which muscle is the main prime mover for abduction of the arm at the shoulder joint?

Accepted Answer

deltoid

Question 5

A soccer player suffers a tear in the muscle that forms the bulk of the calf and attaches to the calcaneal (Achilles) tendon. Which muscle is injured?

Accepted Answer

gastrocnemius

Question 6

Which muscle group is responsible for extending the leg at the knee, and all its members share a common insertion at the patellar ligament?

Accepted Answer

quadriceps femoris

Question 7

A patient is unable to compress their cheeks against their teeth, making it difficult to blow air or whistle. Which muscle is most likely impaired?

Accepted Answer

buccinator

Question 8

Which muscle is the antagonist to the biceps brachii during elbow flexion?

Accepted Answer

triceps brachii

Question 9

A patient presents with difficulty dorsiflexing their foot, resulting in a 'foot drop.' Which muscle is most likely weakened?

Accepted Answer

tibialis anterior

Question 10

Which muscle is responsible for elevating the mandible during chewing?

Accepted Answer

temporalis

Question 11

If a muscle crosses the anterior side of a joint, what is its most likely action?

Accepted Answer

Flexion

Question 12

Which muscle is most important for forced expiration, such as during vigorous exercise or coughing?

Accepted Answer

internal intercostals

Question 13

A patient has difficulty rotating their head to the opposite side and flexing their neck. Which muscle is most likely affected?

Accepted Answer

sternocleidomastoid

Question 14

Which muscle is a part of the rotator cuff and is responsible for medial rotation of the humerus?

Accepted Answer

subscapularis

Question 15

A runner complains of pain along the lateral side of the thigh, especially near the iliotibial tract. Which muscle is most likely involved?

Accepted Answer

tensor fasciae latae

Question 16

Which muscle is responsible for plantar flexion of the foot and is located deep to the gastrocnemius?

Accepted Answer

soleus

Question 17

If the flexor carpi radialis is injured, which movement of the wrist would be most affected?

Accepted Answer

Flexion and abduction

Question 18

Which muscle is most likely to be torn in a shoulder injury involving the rotator cuff?

Accepted Answer

supraspinatus

Question 19

A patient is unable to adduct their thigh and flex their leg at the knee. Which muscle is most likely affected?

Accepted Answer

gracilis

Question 20

Which equation best represents the relationship between muscle force ($$F$$), cross-sectional area ($$A$$), and muscle stress ($$\sigma$$)?

Accepted Answer

$$\sigma = F / A$$

Comprehensive Study Notes: Muscles of the Human Body (Anatomy & Physiology)

Guida di studio - Domande di pratica

Study guide - Flashcard