- published: 14 Dec 2015
- views: 435534
Muscle (from Latin musculus, diminutive of mus "mouse") is a contractile tissue of animals and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to produce force and cause motion. Muscles can cause either locomotion of the organism itself or movement of internal organs. Cardiac and smooth muscle contraction occurs without conscious thought and is necessary for survival. Examples are the contraction of the heart and peristalsis which pushes food through the digestive system. Voluntary contraction of the skeletal muscles is used to move the body and can be finely controlled. Examples are movements of the eye, or gross movements like the quadriceps muscle of the thigh.
There are two broad types of voluntary muscle fibers: slow twitch and fast twitch. Slow twitch fibers contract for long periods of time but with little force while fast twitch fibers contract quickly and powerfully but fatigue very rapidly.
Yeah
Just when I had the money to spend
And I was always thinkin' it would never end
Then the time came to the end of the game
Don't you know
And just when the sky got shiny and bright
There never seemed to be an end of the light
But then the clouds came, it started to rain
Don't you know
Just when it was goin'
Just when it was goin' so good
Just when it
Just when it was goin' so good
But just when the highway straightened out for a mile
And I was thinkin' I'd just cruise for a while
A fork in the road bought a new episode
Don't you know
Just when it
Just when it was goin' so good
Just when it was goin'
Just when it was goin' so good
Baby, don't you worry
I said, baby don't you cry
We're gonna get it together
And I know you're askin' why
Yeah, just when it
Just when it was goin' so good
Just when it was goin'
Just when it was goin' so good, yeah
Yeah
Just when baby