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The Muscular System (Interesting Facts (During exercise, lactic acid…
The Muscular System
Interesting Facts
During exercise, lactic acid builds up, causing fatigue.
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The sliding filament theory explains that muscles contract when actin filaments slide toward each other.
The striation of skeletal muscle are the result of the sarcomeres , which run Z line to Z line (actin filaments attach with filament myofibrils.
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Tissues
Smooth Muscle
Lines many hollow organs. Called an involuntary muscle since we are unable to control its movements. #
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Cardiac Muscle
Also involuntary, this muscle is only located in one location - the heart. This is built specifically to give the heart maximum efficiency and rhythm. #
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Skeletal Muscle
These are the most common muscle in the body. Attached to bones via tendons, these are voluntary muscles, allowing us to move via pulling. #
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2 types of muscles
Fast-twitch muscles
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They rely on anaerobic metabolism because they only have a little bit of mitochondria. This builds up the lactic acid and this is what causes these muscles to fatigue more easily.
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Slow-twitch muscles
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Exercise increases number of mitochondria, but the muscle itself doesn't grow much
