Question 1

During a muscle contraction, which statement best describes the movement of the origin and insertion?

Accepted Answer

The insertion moves towards the origin.

Question 2

Which type of muscle role is responsible for stabilizing the origin of the prime mover during a movement?

Accepted Answer

Fixator

Question 3

The flexor carpi ulnaris attaches to both the humerus and the base of the 5th metacarpal. Based on its action of flexing the hand at the wrist, which attachment is the origin?

Accepted Answer

Humerus

Question 4

Which fascicle arrangement is best suited for generating the greatest force over a short range of motion?

Accepted Answer

Multipennate

Question 5

When lifting your arm to the side (abduction), which muscle acts as the agonist?

Accepted Answer

Deltoid

Question 6

Which lever system is most common in the human body and typically works at a mechanical disadvantage?

Accepted Answer

Third-class lever

Question 7

Given the following equation for mechanical advantage in a lever system: $$MA = \frac{	ext{Effort Arm}}{	ext{Load Arm}}$$, which arrangement would maximize force output?

Accepted Answer

A long effort arm and a short load arm

Question 8

The masseter muscle is primarily responsible for closing the jaw. What is its insertion point?

Accepted Answer

Mandible

Question 9

Which muscle role opposes the action of the prime mover during a movement?

Accepted Answer

Antagonist

Question 10

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

Accepted Answer

The gastrocnemius and tibialis anterior are antagonists.

Question 11

Which type of fascicle arrangement is found in the orbicularis oris muscle?

Accepted Answer

Circular

Question 12

If a muscle has a pennate fascicle arrangement, what is its primary functional advantage?

Accepted Answer

Greater force generation

Question 13

In a third-class lever system, where is the effort applied relative to the fulcrum and the load?

Accepted Answer

Effort is applied between the fulcrum and the load

Question 14

Which statement best describes the mechanical advantage of a second-class lever system?

Accepted Answer

The load is between the fulcrum and the effort, allowing greater force but less speed.

Question 15

Which muscle acts as a synergist when you smile?

Accepted Answer

Mentalis

Question 16

The styloglossus muscle pulls the tongue back, making it a(n) _____ for sticking out your tongue.

Accepted Answer

Antagonist

Question 17

Which of the following best describes the role of a synergist muscle?

Accepted Answer

It assists the prime mover by adding extra force or reducing undesirable movements.

Question 18

Which statement is true regarding the majority of lever systems in the arms and legs?

Accepted Answer

They usually work at a mechanical disadvantage.

Question 19

Which fascicle arrangement is best suited for muscles that need to produce rapid, extensive movements?

Accepted Answer

Parallel

Question 20

If the effort arm in a lever system is 2 cm and the load arm is 8 cm, what is the mechanical advantage? Use $$MA = \frac{	ext{Effort Arm}}{	ext{Load Arm}}.$$

Accepted Answer

$$MA = \frac{2}{8} = 0.25$$

Muscle Anatomy and Physiology: Origins, Insertions, Actions, and Lever Systems

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