Muscle Dynamics & Ranges of Movement Flashcards
What are the 4 properties of a skeletal muscle?
Excitability.
Contractibility.
Extensibility.
Elasticity.
What is meant by the term Torsion?
The action of twisting.
What is meant by the term De-Torsion?
Relates to bringing in line of the active muscles origin and insertion.
Give an example of Torsion and De-Torsion?
The Pronator Teres muscle when rotating the forearm.
Define prime muscles?
The origin further from the axis of the joint than its insertion.
Give an example of a prime muscle?
Biceps Brachii.
Define assistant muscles?
The origin to the axis of rotation than its insertion.
Give an example of a assistant muscle?
Brachioradialis.
What are the 3 factors that influence muscle action?
Attachment.
Configuration of the origin and insertion.
Number of joints crossed.
What are the 3 main contraction types?
Isometric.
Concentric.
Eccentric.
Explain what is meant by isometric contraction?
The muscle under tension stays the same length.
Explain what is meant by concentric contraction?
The muscle shortens under tension.
Explain what is meant by eccentric contraction?
The muscle lengthens under tension.
What are the 4 ranges of movement?
Inner Range.
Middle Range.
Outer Range.
Full Range.
Describe Full range of motion?
When a muscle is fully stretched and contracts to the limit of its normal capacity.
