Muscle Roles in Movement

<p>They prevent movement at the joint (D)</p> Signup and view all the answers

<p>They act together to create a movement neither could achieve alone (D)</p> Signup and view all the answers

<p>Dorsiflexors during ankle plantar flexion (C)</p> Signup and view all the answers

<p>They neutralize undesired actions created by other muscles (B)</p> Signup and view all the answers

<p>Some synergists may cancel out the actions of others (B)</p> Signup and view all the answers

<p>To stabilize one part of the body while another moves. (B)</p> Signup and view all the answers

<p>They contract isometrically to hold the body steady. (B)</p> Signup and view all the answers

<p>Air temperature during exercise. (A)</p> Signup and view all the answers

<p>Physiological cross section. (C)</p> Signup and view all the answers

<p>3-4 kg. (A)</p> Signup and view all the answers

<p>Pennate fibers. (A)</p> Signup and view all the answers

<p>Fibers parallel to the long axis of muscle (A)</p> Signup and view all the answers

<p>It causes anterior tilt of the pelvis. (B)</p> Signup and view all the answers

<p>Longitudinal trunk muscles. (D)</p> Signup and view all the answers

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

<p>Decreases strength of contraction (C)</p> Signup and view all the answers

<p>Can experience active insufficiency (C)</p> Signup and view all the answers

<p>Passive insufficiency (A)</p> Signup and view all the answers

<p>Passive tension producing movement without contraction (A)</p> Signup and view all the answers

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

<p>Passive insufficiency occurs (A)</p> Signup and view all the answers

Muscles primarily responsible for producing a specific movement.

Muscles that oppose the action of agonist muscles, relaxing and lengthening to control movement.

Muscles that work together with agonist muscles to refine or modify a movement.

Two muscles working together to produce a movement neither could do alone.

Muscles that counteract unwanted movements by other muscles.

Muscles that stabilize a joint during a movement, preventing unwanted movement of a fixed part.

The main muscles responsible for a specific movement.

Muscles that assist the prime movers in a movement.

A muscle with long fibers running parallel to its long axis. It provides a large range of motion with less force.

A muscle with short fibers arranged at an angle to its long axis. It generates more force with a shorter range of motion.

A type of pennate muscle where fibers run on one side of a central tendon.

A type of pennate muscle where fibers run on both sides of a central tendon.

A type of pennate muscle with several tendon attachments, creating a web of fibers.

The area of a muscle perpendicular to its fibers. A larger area signifies greater force generation.

When a two-joint muscle cannot shorten further to produce full movement at both joints.

When a two-joint muscle cannot be stretched further without causing pain or restriction at both joints.

Muscles that stabilize a joint during movement, preventing unwanted movement of the fixed part.

Muscle contraction where the muscle length stays the same, generating force without movement.

They help stabilize a body part during movement while the agonist muscles act directly on the joint.

Support muscles contract isometrically to hold body parts in place, preventing unwanted movements.

Area of a muscle that cuts through all muscle fibers perpendicularly, determining its potential force.

Longer muscles can stretch further due to their fiber length, while shorter muscles have less extensibility.

Muscles crossing multiple joints can create movement across all of them, affecting movement range.

Muscle strength is directly related to the physiological cross section, larger area means more force potential.