1
Q
What is the all-or-none law?
A
A muscle motor unit either contracts fully or not at all.
2
Q
What is a motor unit?
A
One nerve and the muscle fibres it controls.
3
Q
Can a muscle fibre half-contract?
A
No. It’s all or none.
4
Q
How do we make more force?
A
By switching on more motor units.
5
Q
When do we use lots of motor units?
A
Heavy or powerful movements.
6
Q
When do we use a few motor units?
A
Light or easy movements.
sport unit 1
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