Muscle+and+Skin

media type="custom" key="4878893" align="right"**Muscle and Skin** 4 main properties of muscle tissues: · Excitability - ability to respond to stimuli · Contractibility - is ability to contract · Extensibility - the ability of a muscle to be stretched without tearing · Elasticity - the ability to return to its normal shape · Your body builds muscle naturally in response to     media type="youtube" key="D7MtiCAQh6c" height="340" width="560" activity · You must keep exercising daily and challenging your muscles in order to build and maintain muscular strength.
 * Muscle functions**: Make movements and maintain posture.
 * Muscular Strength** media type="youtube" key="AgeNnPRIa54" height="340" width="560" Strength     to a muscle's ability to generate force against physical objects


 * Muscle Fibers**

o Fast Twitch - Fast twitch fibers are best used for anaerobic activities. They produce high levels of force for short periods of time and are best suited for power activities such as weightlifting.
====o Slow Twitch - Slow twitch muscle fibers are best used for cardiovascular or aerobic activities. They produce small levels of force for long periods of time and thus are better suited for endurance activities.====

· When the skin is imperfect the rest of the body is greatly affected.
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