The Endocrine System: Hormones

What You'll Learn

The nervous system has two main parts: the central nervous system (brain and spinal cord) and the peripheral nervous system (nerves throughout the body).

Key Words

lung
stomach

Steps

Step 1 — Read

Read the introduction and identify the main idea of this lesson.

Step 2 — Do

Build a model of the respiratory system using a plastic bottle, balloons, and a straw. Show how the diaphragm helps you breathe.

Step 3 — Observe

Look for patterns in your observations.

Step 4 — Record

Make a graph or chart showing your results.

Check Your Understanding

Question 1

1 of 3

What is the function of the heart?