Question 1

What is the action of flexor carpi ulnaris?

Accepted Answer

Flexor carpi ulnaris is a muscle of the forearm that acts to flex and adduct the hand at the wrist joint.

Question 2

Which muscle elevates the scapula?

Accepted Answer

The muscle that elevates the scapula is the levator scapulae.

Question 3

Which of the following muscles does NOT adduct the thigh?

Accepted Answer

The rectus femoris muscle is a part of the quadriceps muscle group and is responsible for extending the knee joint and flexing the hip joint. It does not adduct the thigh.

Question 4

Which group is a synergist to the adductor group?

Accepted Answer

The gracilis muscle is a synergist to the adductor group. It assists in adduction of the hip along with the adductor muscles.

Question 5

Which of the following extends the forearm?

Accepted Answer

The triceps brachii is a muscle located in the back of the upper arm and is responsible for extending the forearm at the elbow joint. The brachioradialis, biceps brachii, and brachialis are all muscles that flex the forearm at the elbow joint.

Question 6

Identify the brachialis muscle.

Accepted Answer

The answer of Identify the brachialis muscle.

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Question 7

Which of the following is NOT a muscle of the rotator cuff?

Accepted Answer

The teres major is not a muscle of the rotator cuff. The rotator cuff consists of the supraspinatus, teres minor, infraspinatus, and subscapularis muscles.

Question 8

Damage to the pectoralis major would interfere with a person's ability to:

Accepted Answer

The pectoralis major is responsible for adduction of the arm at the shoulder joint. Damage to this muscle would interfere with this movement. Abduction of the arm is primarily controlled by the deltoid muscle. Extension of the forearm is controlled by the triceps brachii muscle. Elevation of the scapula is primarily controlled by the trapezius muscle.

Question 9

Which muscle is a powerful agonist of adduction,medial rotation,and extension of the arm?

Accepted Answer

The latissimus dorsi is a large muscle that is a powerful agonist of adduction (bringing the arm towards the midline of the body), medial rotation (rotating the arm towards the body), and extension (bringing the arm back behind the body) of the arm. The deltoid muscle is involved in shoulder abduction, flexion, and extension, but not medial rotation. The pectoralis minor is involved in shoulder protraction, depression, and downward rotation, but not adduction, medial rotation or extension. The brachialis muscle is involved in elbow flexion.

Question 10

Which muscle assists with the erection of the penis and clitoris?

Accepted Answer

The bulbospongiosus muscle assists with the erection of the penis and clitoris by compressing the deep dorsal vein of the penis or clitoris, helping to trap blood within the corpora cavernosa and enhance their rigidity.

Question 11

Iliopsoas is formed by the union of two muscles known as:

Accepted Answer

Iliopsoas is formed by the union of two muscles called iliacus and psoas major.

Question 12

Where does infraspinatus insert?

Accepted Answer

The infraspinatus muscle inserts onto the greater tubercle of the humerus, specifically on the posterior aspect of the tubercle.

Question 13

Which muscle flexes the hand and abducts the hand?

Accepted Answer

The flexor carpi radialis muscle flexes the hand and abducts the hand. The extensor digitorum muscle extends the fingers, palmar interossei muscles adduct the fingers, and abductor pollicis longus muscle abducts the thumb.

Question 14

Which of the following muscles extends the leg at the knee joint?

Accepted Answer

The rectus femoris muscle is one of the quadriceps muscles located in the anterior thigh. Its main function is to extend the leg at the knee joint.

Question 15

Identify the deltoid muscle.

Accepted Answer

The answer of Identify the deltoid muscle.

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Question 16

Which muscle provides voluntary control of defecation?

Accepted Answer

The external anal sphincter muscle provides voluntary control of defecation by contracting to keep the anal canal closed until it is appropriate to defecate. The other muscles listed also play a role in controlling pelvic floor function, but are not primarily responsible for voluntary control of defecation.

Question 17

The quadriceps femoris group includes all of the following EXCEPT:

Accepted Answer

The biceps femoris is not a part of the quadriceps femoris group. It is actually a part of the hamstring muscle group. The quadriceps femoris group is composed of the vastus lateralis, vastus medialis, vastus intermedius, and rectus femoris.

Question 18

Muscles that move the thumb will be named using the term:

Accepted Answer

The name "pollicis" refers specifically to the thumb, so muscles that move the thumb often include "pollicis" in their name.

Question 19

The vastus lateralis,vastus medialis,and vastus intermedius muscles insert on the:

Accepted Answer

The vastus lateralis, vastus medialis, and vastus intermedius muscles make up the quadriceps muscle group and all insert on the patella and tibial tuberosity of the tibia, helping to extend the leg at the knee joint. Therefore, choice B is the correct answer.

Question 20

The deltoid is responsible for:

Accepted Answer

The deltoid muscle is responsible for abducting the arm, meaning lifting the arm away from the body.

Quiz 9: The Muscular System