What is myelin?

What are the upper chambers of the heart called?

Gas exchange occurs in the ____.

The esophagus sends food using involuntary contractions called

This organ is important to the digestive system because it filters toxins from the blood.

At what point does digestion begin?

Which type of nerve travels from the brain to the muscles?

Breaking food into a new substance is what kind of reaction

Which of these carry oxygen and remove waste from the body?

Which of these cause clotting?

Which energy change occurs in the digestive system?

Why is it important for the integumentary system to maintain homeostasis?

_________ have three parts: the cell body, dendrites, and the axon

The urethra:

This muscle tightens and relaxes to help make a person breathe in and out.

This tube is called the windpipe

What is the 'voicebox'?

Which one of these is NOT a way the body can expel dirt, dust, and germs?

These systems are a part of the Peripheral Nervous System

Nephrons are basic structures of what organ?

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