📈 SET 22: Force & Recruitment AND ⚡ SET 23: Muscle Energy Systems AND 😴 SET 24: Muscle Fatigue
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17 Terms
How do muscles increase force?
By recruiting more motor units
What is recruitment?
Activating additional motor units
What is the all-or-none principle?
Each fiber contracts fully or not at all
How can overall force vary if fibers are all-or-none?
By changing the number of fibers activated
Why are smaller motor units recruited first?
They require less stimulation
What is the immediate source of energy for muscle contraction?
ATP
How long does stored ATP last?
A few seconds
What is creatine phosphate used for?
Quickly regenerate ATP
What is glycolysis?
ATP production without oxygen
What is aerobic respiration?
Long-term ATP production using oxygen
Which energy system produces the most ATP?
Aerobic respiration
Which system is fastest?
Creatine phosphate system
What is muscle fatigue?
The inability to maintain contraction
What causes fatigue?
ATP depletion, ion imbalance, and lactic acid buildup
Does fatigue mean muscles are out of energy?
No, it prevents damage
Why is fatigue protective?
It prevents muscle injury
What happens during recovery?
ATP and oxygen levels are restored
