Exercise and Muscle Contractions Flashcards
A single contraction of muscle fibres from a nerve impulse that lasts a mere fraction of a second
Muscle Twitch
Contraction of the individual fibres is all or none once it reaches a certain _________.
Threshold
The contraction of the Whole Muscle can vary in strength depending on the number of muscles fibres ___________.
Contracting
A muscle twitch can be divided into 3 periods which are..
- Latent Period
- Contraction Period
- Relaxation Period
The period of time between stimulation and initiation of contraction.
Latent Period
When the muscle shortens
Contraction Period
When the muscle returns to its former length
Relaxation Period
When a muscle is given rapid series of threshold stimuli (can respond without relaxing completely).
Summation
The second twitch is added to the first producing a _______ force of contraction.
Greater
The strength of the contraction depends on how _____/_______ the second stimulus is to the first stimulus.
Close/Quickly
Maximal sustained contraction.
Tetanus
What is occurring when the graph no longer shows individual twitches and show a straight line?
Tetanus
When does Tetanus stop?
When the muscle fatigues due to depletion of energy reserves.
Which type of twitch is this?
-Contract slow, resist fatigue
-Found in long-distance runners, swimmers, and bikers
Slow Twitch
Which type of twitch breaks down ATP slowly and efficiently, relying on aerobic respiration?
Slow Twitch
