Anatomical Directional Terms and Joint Classifications

<p>Number of motor units (C)</p> Signup and view all the answers

<p>10 newtons (D)</p> Signup and view all the answers

<p>Second-class lever (B)</p> Signup and view all the answers

<p>Increases mechanical advantage (B)</p> Signup and view all the answers

<p>0.2 (B)</p> Signup and view all the answers

<p>It decreases the speed of movement but increases the force required. (A)</p> Signup and view all the answers

<p>It reduces the amount of force required to lift a load by distributing the force over a greater distance. (D)</p> Signup and view all the answers

<p>Pennate muscles have more muscle fibers attached to a single tendon, increasing the number of force units working in unison. (A)</p> Signup and view all the answers

<p>Fusiform muscles generally have a low to medium level of force production due to their tapered shape. (C)</p> Signup and view all the answers

<p>All of the above. (D)</p> Signup and view all the answers

<p>Eccentric (C)</p> Signup and view all the answers

<p>As the angle of pennation increases, the force generated increases. (D)</p> Signup and view all the answers

<p>Increased speed of contraction (D)</p> Signup and view all the answers

<p>Fast-twitch fibers (D)</p> Signup and view all the answers

<p>Generate high force, but low speed (A)</p> Signup and view all the answers

<p>Greater angles of pennation lead to slower contraction speeds. (D)</p> Signup and view all the answers

<p>Eccentric (C)</p> Signup and view all the answers

<p>Length of sarcomeres (D)</p> Signup and view all the answers

<p>Maximizes force production (C)</p> Signup and view all the answers

<p>They have a larger range of motion compared to fusiform muscles. (C)</p> Signup and view all the answers

The wheel has a mechanical advantage when its radius is greater than the axle's radius.

The main considerations for muscle action include joint movement, muscle crossing joints, and muscle location.

The length of the muscle during contraction affects the amount of active tension it can develop.

Skeletal muscles can be named based on characteristics like size, number of parts, and fiber type.

To balance a 5 newton resistance with distance factors, 10 newtons of tension is required.

Muscle develops enough force to overcome resistance or gravity.

Muscle gradually lessens tension to control descent of resistance.

Muscle tension maintains joint angle in a stable position.

Automatic response to a muscle being stretched, involving muscle spindle proprioceptors.

Process where the contraction of one muscle relaxes its antagonist.

Muscle that crosses two joints and can affect movement at both.

Increase in the number of activated muscle fibers for a stronger contraction.

Levers classified into first, second, and third classes based on effort, resistance, and fulcrum position.

The ratio of the resistance arm to the force arm in a lever system.

The distance from the fulcrum to where the force is applied; and the distance from the fulcrum to the resistance.

A simple machine that helps lift heavy objects with less effort.

A simple machine consisting of a wheel attached to a central axle, helping to reduce friction.

The action of bending the knee, which involves contraction of the hamstrings.

The process where the nervous system recruits motor units to generate more force.

The maximum force generated by muscle fibers at varying lengths.

The pivot point around which a lever rotates.