Q: Which equation best represents the relationship between force, load, and lever arm in a lever system?

$$F_{effort} \times d_{effort} = F_{load} \times d_{load}$$

Question 1

During muscle contraction, which part of the muscle moves toward the other?

Accepted Answer

The insertion moves toward the origin.

Question 2

A muscle with its origin on the pubis and insertion on the xiphoid process would most likely produce which movement?

Accepted Answer

Flexion of the trunk

Question 3

The flexor carpi ulnaris attaches to the humerus and the base of the 5th metacarpal. Which attachment is the origin?

Accepted Answer

Humerus

Question 4

Which bone is the insertion of the masseter muscle?

Accepted Answer

Mandible

Question 5

Which term describes the muscle that is primarily responsible for a movement?

Accepted Answer

Agonist (prime mover)

Question 6

If the biceps brachii flexes the elbow joint, what is the role of the triceps brachii during this movement?

Accepted Answer

Antagonist

Question 7

A fixator works to stabilize which part of the agonist during a movement?

Accepted Answer

The origin of the agonist

Question 8

The genioglossus is the primary muscle for sticking out your tongue. The styloglossus pulls the tongue back in. What is the role of the styloglossus?

Accepted Answer

Antagonist

Question 9

The gastrocnemius and soleus are both located in the posterior calf, while the tibialis anterior is in the anterior lower leg. Which statement is most likely true?

Accepted Answer

The gastrocnemius and tibialis anterior are antagonists.

Question 10

Muscles generate force using lever systems. In a third-class lever, where is the force applied?

Accepted Answer

Between the fulcrum and the load

Question 11

Most lever systems in the arms and legs are third-class levers. What does this imply about their mechanical advantage?

Accepted Answer

The muscles of the arms and legs usually work at a mechanical disadvantage.

Question 12

Which fascicle arrangement is best suited for generating a lot of force over a small distance?

Accepted Answer

Multipennate

Question 13

Which muscle does NOT belong in the group based on fascicle arrangement: Rectus Abdominis, Interossei, Bicep Brachii, Sternocleidomastoid?

Accepted Answer

Interossei

Question 14

Based on the name, how does the fibularis brevis compare to the fibularis longus?

Accepted Answer

The fibularis brevis muscle is relatively short while the fibularis longus is relatively long.

Question 15

Based on the name, how would you expect the orbicularis oris muscle to be shaped?

Accepted Answer

Circular

Question 16

Which of the following muscle names does NOT provide information about the muscle’s actions?

Accepted Answer

Transverse abdominis

Question 17

If a muscle’s origin is wider than its insertion, what type of fascicle arrangement does it most likely have?

Accepted Answer

Convergent

Question 18

Which equation best represents the relationship between force, load, and lever arm in a lever system?

Accepted Answer

$$F_{effort} 	imes d_{effort} = F_{load} 	imes d_{load}$$

Question 19

A muscle with a circular fascicle arrangement is most likely to be found where?

Accepted Answer

Around the eye or mouth

Question 20

Which muscle naming convention is used for the biceps femoris?

Accepted Answer

Body region and number of heads

Muscular System: Origin, Insertion, Actions, Levers, Fascicle Arrangements, and Muscle Naming

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