In your body the _____________ are made of spongy tissue with lots of surface area to increase contact with the air.

The ___________ run throughout the human body and send signals to and from the brain.

The ____________ system has branch endings in the skin that recieve signals and send them to the brain.

Arteries and veins branch out into the smallest blood vessels called

Digestion begins in the mouth. Food is broken down by __________ in the mouth.

The small intestine continues digestion and

The difference between voluntary and involuntary muscles is that

Arm muscles are

The function of the _____________ system is to break down food for energy and nutrients.

The ____________ system controls both the voluntary and involuntary movements of the human body.

The muscular system provides __________ for the body.

Acids and churning in the stomach continue the process of

The ________ filters liquids in the body and excrete wastes through th bladder and skin.

Which system received the external signal of hearing that enabled the boy to respond to the car horn before crossing into the street on his bike.

The lungs expand and draw in air when the diaphragm

The pumping of the heart in the human body happens

The function of the excretory system is to

The expanding and contracting of the lungs is

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