Q: Which of the following equations correctly represents the law of the lever in muscle mechanics?

$Effort \\times Effort\\ Arm = Load \\times Load\\ Arm$

Question 1

Which connective tissue layer surrounds an individual muscle fiber in skeletal muscle?

Accepted Answer

Endomysium

Question 2

A muscle that assists the prime mover by adding extra force or reducing unnecessary movement is called a:

Accepted Answer

Synergist

Question 3

Which of the following best describes a third-class lever in the human body?

Accepted Answer

The effort is applied between the fulcrum and the load

Question 4

A muscle with fascicles arranged in concentric rings, such as the orbicularis oris, is classified as which fascicle pattern?

Accepted Answer

Circular

Question 5

If a muscle is named 'biceps brachii,' what does the prefix 'biceps' indicate?

Accepted Answer

It has two origins

Question 6

Which of the following statements about skeletal muscle contraction is correct?

Accepted Answer

Muscles can only pull, never push

Question 7

A patient is unable to close their mouth due to paralysis of a muscle. Which muscle is most likely affected?

Accepted Answer

Masseter

Question 8

Which of the following best describes the mechanical advantage of a lever system?

Accepted Answer

Effort is farther from the fulcrum than the load

Question 9

Which muscle is responsible for allowing you to smile by elevating the corners of your mouth?

Accepted Answer

Zygomaticus

Question 10

A muscle with fascicles that insert into a central tendon from both sides, resembling a feather, is classified as:

Accepted Answer

Bipennate

Question 11

Which of the following equations correctly represents the law of the lever in muscle mechanics?

Accepted Answer

$Effort \times Effort\ Arm = Load \times Load\ Arm$

Question 12

Which muscle is primarily responsible for closing the eyelids?

Accepted Answer

Orbicularis oculi

Question 13

A muscle that opposes or reverses a particular movement is called a(n):

Accepted Answer

Antagonist

Question 14

Which of the following muscles is NOT innervated by the trigeminal nerve (cranial nerve V)?

Accepted Answer

Buccinator

Question 15

If the effort arm is 5 cm and the load arm is 10 cm, and the load is 20 N, what is the minimum effort required to lift the load using a lever? Use the law of the lever: $Effort \times Effort\ Arm = Load \times Load\ Arm$.

Accepted Answer

40 N

Question 16

Which fascicle arrangement allows for the greatest range of motion but the least power?

Accepted Answer

Parallel

Question 17

Which muscle is responsible for compressing the cheeks, as in blowing a trumpet?

Accepted Answer

Buccinator

Question 18

A muscle named 'flexor carpi radialis longus' indicates all of the following EXCEPT:

Accepted Answer

It is the shortest muscle in the group

Question 19

Which of the following is a function of a fixator muscle?

Accepted Answer

Immobilizes the origin of a prime mover

Question 20

Which muscle is responsible for elevating the mandible during mastication?

Accepted Answer

Temporalis

Study Notes: Chapter 9 - The Muscular System (Anatomy & Physiology)

Study Guide - Practice Questions

Study Guide - Flashcards