Q: Which equation correctly represents the law of the lever for muscle mechanics?

$$F_e \times d_e = F_l \times d_l$$

Question 1

Which of the following best describes the role of a synergist muscle during a bicep curl exercise?

Accepted Answer

It assists the biceps brachii in flexing the forearm at the elbow.

Question 2

A muscle that stabilizes the origin of another muscle so that it can act more efficiently is called a:

Accepted Answer

Fixator

Question 3

Which of the following is NOT a criterion used in naming skeletal muscles?

Accepted Answer

Type of nerve supply

Question 4

A muscle with a circular fascicle arrangement, such as the orbicularis oris, is best suited for which function?

Accepted Answer

Closing body openings

Question 5

In a third-class lever system, such as the biceps curl, which of the following is true?

Accepted Answer

The effort is applied between the fulcrum and the load.

Question 6

Which equation correctly represents the law of the lever for muscle mechanics?

Accepted Answer

$$F_e 	imes d_e = F_l 	imes d_l$$

Question 7

A patient is unable to extend their knee after an injury. Which muscle is most likely affected?

Accepted Answer

Rectus femoris

Question 8

Which fascicle arrangement is best suited for producing the greatest range of motion?

Accepted Answer

Parallel

Question 9

During a calf raise, the ball of the foot acts as the fulcrum, the body weight as the load, and the calf muscles provide the effort. What class of lever is this?

Accepted Answer

Second-class

Question 10

If the effort arm is longer than the load arm in a lever system, what is the mechanical advantage?

Accepted Answer

Mechanical advantage (power lever)

Question 11

Which muscle is an example of a fusiform fascicle arrangement?

Accepted Answer

Biceps brachii

Question 12

A muscle that opposes the action of the prime mover is called a(n):

Accepted Answer

Antagonist

Question 13

Which of the following best explains why pennate muscles generate more force than parallel muscles?

Accepted Answer

They have more muscle fibers packed into a given muscle length.

Question 14

Which muscle is responsible for flexion of the forearm at the elbow and is innervated by the musculocutaneous nerve?

Accepted Answer

Biceps brachii

Question 15

A muscle named 'extensor carpi radialis longus' provides which information about the muscle?

Accepted Answer

It extends the wrist, is located near the radius, and is long.

Question 16

Which of the following scenarios best illustrates a first-class lever in the human body?

Accepted Answer

Nodding the head (atlanto-occipital joint)

Question 17

If a muscle's insertion moves toward its origin during contraction, which of the following is true?

Accepted Answer

The muscle is producing movement at a joint.

Question 18

Which of the following best describes the action of the quadriceps femoris group?

Accepted Answer

Extension of the knee

Question 19

A muscle with a convergent fascicle arrangement, such as the pectoralis major, is characterized by:

Accepted Answer

Fascicles converging toward a single tendon of insertion

Question 20

During a biceps curl, which of the following correctly identifies the roles of the biceps brachii and triceps brachii?

Accepted Answer

Biceps brachii is the agonist; triceps brachii is the antagonist.

Skeletal Muscle Actions, Naming, and Mechanics: Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard