1.
one way to care for your muscular system is to

make sure you do not get more than five hours of sleep a night.

warm up and cool down when exercising.

eat a diet high in sugar and fat.

watch at least three hours of television a day.
2.
one habit to avoid in order to keep your body systems healthy is

sleeping seven hours a night.

eating a well-balanced meal.

exercising.

using illegal drugs.
3.
which body system is in charge of breaking down food for use by the body cells?

respiratory system

digestive system

skeletal system

cardiovascular system
4.
proteins are the body’s main source of energy.

true

false
5.
what is the function of carbohydrates in a healthy diet?

the body grow

moving food through the digestive system

providing energy for the body

transporting fat-soluble vitamins