Kidneys and the Excretory System

What You'll Learn

Eyes detect light using the retina, which contains rod cells (for dim light) and cone cells (for color). The lens focuses light onto the retina, creating an image the brain interprets.

Key Words

circulatory system
respiratory system
organ system

Steps

Step 1 — Read

Review the background information on The Human Body before starting.

Step 2 — Do

Test your peripheral vision: stare straight ahead while a partner slowly moves a colored card from behind your head to the front. Record when you first see the color.

Step 3 — Observe

Draw a detailed diagram of what you observe.

Step 4 — Record

Write a conclusion: what did your results show? Did they match your prediction?

Check Your Understanding

Question 1

1 of 3

What are the five basic tastes?