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Muscle Fatigue

Description
The inability to maintain force of contraction after prolonged activity
Due to:
Inadequate release of Ca2+ from SR
Depletion of CP, oxygen, and nutrients
Build up of lactic acid and ADP
Insufficient release of ACh at NMJ

Oxygen Consumption After Exercise

Why do you continue to breathe heavily for a period of time after stopping exercise?
Oxygen debt
Replenish CP stores
Convert lactate into pyruvate
Reload O2 onto myoglobin

Control of Muscle Tension


A motor unit consists of a somatic motor neuron and the muscle fibers it innervates
The strength of a contraction depends on how many motor units are activated
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