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Week 7 Lecture 1

Muscle System Part 2

What is motor unit recruitment? The process of increasing the number of active motor units.
When do sarcomeres produce maximal tension? When thick and thin filaments overlap between about 100-120%.
What happens if a sarcomere is stretched too far? There will be insufficient overlap of the myofilaments and so the force produced will be reduced.
What happens if muscle is over contracted? The potential for further contraction is reduced which reduces the amount of force produced.
What must force of contraction for the whole muscle account for? Active (contractile) and passive (series and parallel elastic elements) components.
How would you consider the passive force for lengths less than the normal resting length (l0)? Negligible.
What happens to the muscle in isometric contraction? Muscle contracts but does not shorten -> no movement.
Which direction would your arm move if your bicep was in concentric contraction? Wrist moves towards shoulder.
In which direction would your arm move if your bicep was in eccentric contraction? Wrist moves away from shoulder.
Is force greater during lengthening or shortening contractions? Force is greater during lengthening (eccentric) than shortening (concentric) contractions.
What affect does concentric velocity have on force? The greater the concentric velocity, the smaller the force.
When can the largest force be applied? At the fastest eccentric motion.
What muscle contraction is used most often for measuring muscle strength and why? Isometric contractions are used most often because they are safe to conduct (no movement avoids potential collisions with objects in the vicinity).
Created by: cliffy



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