<span>Receptors in muscles provide the brain with information about body position and movement. The brain controls the contraction of skeletal muscle. The nervous system regulates the speed at which food moves through the digestive tract.Your muscular system is closely connected to the nervous system.</span>
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you didnt give us the equation
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A polar molecule is a molecule that has a positive and negative charge at either end.
<span>A change in a organism's surroundings that causes the organism to react is called a stimulus</span>
