$$\text{Torque} = \text{Force} \times \text{Lever Arm}$$

Question 1

Which of the following best describes the function of intercalated discs in cardiac muscle tissue?

Accepted Answer

They provide structural support and allow for synchronized contraction of cardiac muscle cells.

Question 2

A muscle that originates on the ilium and inserts on the femur (lesser trochanter) is responsible for which action at the hip?

Accepted Answer

Hip flexion

Question 3

Which lever class is most common in the human body, and which muscle group is an example of this lever?

Accepted Answer

3rd class lever; hamstrings

Question 4

During forced inhalation, which muscles are actively involved in increasing the volume of the thoracic cavity?

Accepted Answer

Sternocleidomastoid, scalenes, serratus anterior, and pectoralis minor

Question 5

Which equation best represents the relationship between force, lever arm, and torque in muscle movement?

Accepted Answer

$$	ext{Torque} = 	ext{Force} 	imes 	ext{Lever Arm}$$

Question 6

Which muscle is the prime mover for knee extension, and what is its origin?

Accepted Answer

Rectus femoris; ilium (ASIS)

Question 7

A patient presents with difficulty puckering their lips. Which muscle is most likely affected?

Accepted Answer

Orbicularis oris

Question 8

Which muscle is responsible for plantarflexion and eversion of the foot, and where does it insert?

Accepted Answer

Fibularis longus; 1st metatarsal

Question 9

Which muscle group is primarily responsible for flexion of the forearm at the elbow?

Accepted Answer

Biceps brachii and brachialis

Question 10

Which of the following statements about smooth muscle is correct?

Accepted Answer

Smooth muscle cells are elongated, spindle-shaped, and have a single nucleus.

Question 11

Which muscle is the prime mover for arm abduction, and what is its insertion?

Accepted Answer

Deltoid; humerus (deltoid tuberosity)

Question 12

Which muscle is involved in head rotation and flexion, and where does it insert?

Accepted Answer

Sternocleidomastoid; mastoid process of temporal bone

Question 13

Which muscle is responsible for wrist flexion and abduction, and what is its origin?

Accepted Answer

Flexor carpi radialis; humerus (medial epicondyle)

Question 14

Which muscle is the prime mover for dorsiflexion of the foot, and where does it insert?

Accepted Answer

Tibialis anterior; 1st metatarsal

Question 15

Which muscle is responsible for flexion of the digits and originates from the humerus (medial epicondyle)?

Accepted Answer

Flexor digitorum superficialis

Question 16

Which muscle is involved in forced exhalation by decreasing the size of the thoracic cavity?

Accepted Answer

Internal intercostals

Question 17

Which muscle is the prime mover for hip extension and lateral rotation, and what is its insertion?

Accepted Answer

Gluteus maximus; iliotibial tract

Question 18

Which muscle compresses the cheeks against the teeth and lips, and where is it located?

Accepted Answer

Buccinator; cheek (buccal region)

Question 19

Which muscle is responsible for lateral rotation of the arm and is part of the rotator cuff?

Accepted Answer

Infraspinatus

Question 20

Which muscle is responsible for flexion of the thigh and originates from the lumbar vertebrae?

Accepted Answer

Psoas major

Comprehensive Study Guide: Skeletal, Cardiac, and Smooth Muscles & Muscle Naming in Anatomy and Physiology

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