# data[].attributes.body
muscles are considered the "engine" of the body 

# data[].attributes.body
muscles are considered the "engine" of the body

# data[].attributes.body
What powers the things that cause movement?
computer chip
engine's
"A single muscle cell is elongated in shape"
"The elongated shape allows the contraction proteins to line up in an overlapping pattern that makes muscle flexing possible"

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How many things cause movement?
different things that cause movement are below
-natural forces
Natural forces include wind, water, earthquakes, tornadoes, hurricanes, etc.
-vehicles
other things can make things move by carrying them. these things include cars, trucks, boats, planes, etc.
- living things
living things can cause movement by physically touching them, these include humans and animals.
Are all muscles the same?
No, almost all muscles act and work in different ways. There are 3 main types of muscles, they include cardiac muscle cells, skeletal muscle cells, and smooth muscle cells. Those are in order from biggest to smallest.

# data[].attributes.body
3. How do the surrounding features of an area affect movement?

People change ways of travel to adapt to the environment they are traveling :
- Increasing speed of travel
- Increasing comfort of travel
- Increasing safety of travel
- Decreasing cost of travel
- Changing shape of transport to adapt to travel
- Increasing overall efficiency of travel

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How Does Tectonic Plates Move?
How Much Muscle is in the Human Body ?
Over 650 - 850 muscles in a human body
40% of our body weight
3 types of muscles in our body:  Skeletal, Visceral, and Cardiac
3 categories of muscles: Skeletal, Smooth, and Cardiac
Skeletal =  Striped Fibers
" Involuntary"
Smooth = " Involuntary "  Stomach and Intestinal Walls
Cardiac = Heart to Involuntary