Muscle
Muscle is a soft tissue found in most animals. Muscle cells contain protein filaments of actin and myosin that slide past one another, producing a contraction that changes both the length and the shape of the cell. Muscles function to produce force and motion. They are primarily responsible for maintaining and changing posture, locomotion, as well as movement of internal organs, such as the contraction of the heart and the movement of food through the digestive system via peristalsis.
Muscle tissues are derived from the mesodermal layer of embryonic germ cells in a process known as myogenesis. There are three types of muscle, skeletal or striated, cardiac, and smooth. Muscle action can be classified as being either voluntary or involuntary. Cardiac and smooth muscles contract without conscious thought and are termed involuntary, whereas the skeletal muscles contract upon command. Skeletal muscles in turn can be divided into fast and slow twitch fibers.
Muscles are predominantly powered by the oxidation of fats and carbohydrates, but anaerobic chemical reactions are also used, particularly by fast twitch fibers. These chemical reactions produce adenosine triphosphate (ATP) molecules that are used to power the movement of the myosin heads.
Podcasts:
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by Matty B
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by Matty B
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by Matty B
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by Matty B
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
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by Moto Boy
We Are Never Ever Getting Back Together
by: Matty BI remember right when I woke up the first time
My mom had told me she had set it up by lunch time
You were coming over here to play at my house
We needed a play date, I threw up in my mouth
Never thought that I'd be this fed up so soon
'Till you put your hands on all the stuff in my room
Remember how I even made a sign said, "Keep out!"
I'm gone for one minute, I come back you sneak out
Ohhh you know just how to make me crazy
Ohhh this time I'm telling you I'm telling you
We are never ever ever getting back together
We are never ever ever getting back together
You go talk to your mom talk to my mom talk to me
But we are never ever ever ever getting back together
I'm really miss how immature you are
Working half an hour to make sure I fall
Over when we have to watch TV together
I'm come in, you trip me, spill popcorn, then feathers
Ohhh you know just how to make me crazy
Ohhh this time I'm telling you I'm telling you
We are never ever ever getting back together
We are never ever ever getting back together
You go talk to your mom talk to my mom talk to me