Question:

What supports a body and enables it to move? You probably have already learned that you need muscles in order to move. At the be

What supports a body and
enables it to move?
You probably have already learned that you need muscles in order to move.
At the beginning of the lesson, you saw a girl support the weight of her
body with just her arms by using her muscles. How do muscles work?
A muscle is made of strong tissue that can contract in an orderly way. When
a muscle contracts, the cells of the muscle become shorter. When the
muscle relaxes, the cells return to their original length.
Contracted
Relaxed
You might recall that mitochondria are the main energy producers in a cell.
Because so much energy is required for muscle function, muscle cells are
packed with mitochondria.
Muscles allow for movement of the body, but they do not work alone.
Brainstorm and write or illustrate what other systems help the body move.
Muscles enable the body to move, but cannot function without the support of
bones. Bones can move because they are attached to muscles. The skeletal
system and the muscular system work together and move your body.
Want more information?
Go online to read more about body
systems that provide structure and
support.
FOLDABLES
Go to the Foldables® library to make a
Foldable that will help you take notes
while reading this lesson.

What supports a body and enables it to move? You probably have already learned that you need muscles in order to move. At the beginning of the lesson, you saw a girl support the weight of her body with just her arms by using her muscles. How do muscles work? A muscle is made of strong tissue that can contract in an orderly way. When a muscle contracts, the cells of the muscle become shorter. When the muscle relaxes, the cells return to their original length. Contracted Relaxed You might recall that mitochondria are the main energy producers in a cell. Because so much energy is required for muscle function, muscle cells are packed with mitochondria. Muscles allow for movement of the body, but they do not work alone. Brainstorm and write or illustrate what other systems help the body move. Muscles enable the body to move, but cannot function without the support of bones. Bones can move because they are attached to muscles. The skeletal system and the muscular system work together and move your body. Want more information? Go online to read more about body systems that provide structure and support. FOLDABLES Go to the Foldables® library to make a Foldable that will help you take notes while reading this lesson.