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- [Voiceover] Unfortunately,
just like any other system,

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the muscular system can have
various diseases and disorders.

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One to look at is Muscular Dystrophy.

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In the case of Muscular Dystrophy,

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it's hereditary.

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It's passed on from parent to child.

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The problem is

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in the particular sequence,
you're missing a gene

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that produces a protein.

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Missing this one protein

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of the thousands, just
this one missing one,

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will cause muscular dystrophy.

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Tetanus.

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Kind of briefly mentioned
this one already.

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But tetanus is going to
be a bacterial infection.

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And this bacterial infection actually

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causes your muscles to freeze.

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It causes them to lock up,

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prevents you from moving them.

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And can become quite painful if they stay

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locked up for long periods of time.

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Muscle cramps.

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I'm willing to bet most of you have

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had a muscle cramp at some point.

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It's pretty much an
uncontrolled flex of muscle.

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The muscle itself is tightening up

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and you can not release it.

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These cramps last for

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minutes,

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all the way up through hours and hours.

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The most common cause of
cramps or muscle cramps

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is either dehydration,

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you don't have enough water,

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or ion imbalance,

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you don't have enough electrolytes.

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Or the proper amount of electrolytes.

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So cramps.

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They're most commonly gonna
occur after working out,

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and in the morning after
you get up from bed.

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Well if questions of why.

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Well when you're sleeping in bed,

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I'm pretty sure you're not
drinking water all night.

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So therefore by the time
you wake in the morning

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your body might be a
little bit dehydrated.

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Well after working out,

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you're sweating a lot.

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By sweating a lot, you're losing fluid

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and losing ions.

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Losing those electrolytes.

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Which means the layers of electrolytes

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in your system could be low.

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A pulled muscle.

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Sounds pretty basic.

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But what a pulled muscle actually is

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is taking the muscle fibers

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and stretching them beyond their limits.

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Sometimes by stretching the muscle too far

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you can actually damage the muscle.

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You can tear and rip all these fibers.

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So pulled muscles.

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You can do it simply
by stretching too much.

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You can do it by exercising

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and all of a sudden just turn
the wrong way or something.

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There really is no one way

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to get a pulled muscle.

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As long as the muscle
was stretched too far,

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it can result in a pulled muscle.

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Fasciitis.

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Fasciitis is a kind of
an interesting problem

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because an inflammation
of the connective tissue

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around the muscle.

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So it's meant to help
hold the muscle together

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to give a nice protective outer casing.

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But now if that outside
layering becomes inflamed

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it's fasciitis.