Steps of muscle contraction: Is when your muscle stiffen/ tighten up.
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Muscle Fatigue: According to the medical dictionary, muscle fatigue is "A state of exhaustion or loss of strength and/or muscle endurance following strenuous activity associated with the accumulation of lactic acid in muscles."
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Oxygen debt is when the body goes into its "extra oxygen tank" because you've used the all of your ready to use oxygen in some type of strenuous activity- most likely exercise. Your body then has to turn lactic acid into glucose. Image result for oxygen debt diagram anatomy


Disease with the Muscular System:
Myasthenia Gravis: A condition that makes your muscles weak.

Symptoms: Weakness

Long/ short term effects: Trouble walking, droopy eyelids, double vision, and trouble talking.

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