Musculoskeletal Third-Class Lever Quiz
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Questions and Answers

In a third-class lever, the external weight always has greater leverage than the muscle force.

False

Third-class levers are the least common type of lever in the musculoskeletal system.

False

Third-class levers provide high forces that can be used to stabilize the joint effectively.

False

In a third-class lever, the mechanical advantage is always greater than 1.

<p>False</p> Signup and view all the answers

Vector resolution is the process of replacing two or more forces with a single force that is equivalent to the original forces.

<p>False</p> Signup and view all the answers

The rotatory component in a third-class lever acts parallel to a bony segment.

<p>False</p> Signup and view all the answers

The translatory component in a third-class lever compresses and stabilizes the joint.

<p>False</p> Signup and view all the answers

A free body diagram includes forces like Sy, Wx, and S.

<p>False</p> Signup and view all the answers

Musculoskeletal forces applied to the body can only cause translation of a body segment.

<p>False</p> Signup and view all the answers

The moment arm (D) is the shortest distance between the force (F) and the axis of rotation (AoR).

<p>True</p> Signup and view all the answers

Torque (T) is the product of the force (F) and the moment arm (D).

<p>True</p> Signup and view all the answers

The internal moment arm (IMA) is the distance between the joint's axis of rotation and the effective site of external force application.

<p>False</p> Signup and view all the answers

The external moment arm (EMA) is the distance between the joint's axis of rotation and the effective internal force.

<p>False</p> Signup and view all the answers

The equation $IF \times D = EF \times D_1$ is always true.

<p>True</p> Signup and view all the answers

The internal torque is always equal to the external torque.

<p>True</p> Signup and view all the answers

The majority of human movement is translational, not rotational.

<p>False</p> Signup and view all the answers

In a first-class lever, the axis of rotation is positioned between the opposing forces.

<p>True</p> Signup and view all the answers

The head is held in equilibrium when the product of muscle force (MF) and internal moment arm (IMA) equals the product of head weight (HW) and external moment arm (EMA).

<p>True</p> Signup and view all the answers

In a first-class lever, the internal and external forces act in the same linear direction.

<p>True</p> Signup and view all the answers

The mechanical advantage of the first-class lever example given in the text is 0.8.

<p>False</p> Signup and view all the answers

In a second-class lever, the axis of rotation is located at one end of a bone.

<p>True</p> Signup and view all the answers

The calf muscles are an example of a second-class lever.

<p>True</p> Signup and view all the answers

In a second-class lever, the muscle force has less leverage than the external force.

<p>False</p> Signup and view all the answers

Second-class levers are common in the musculoskeletal system.

<p>False</p> Signup and view all the answers

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