Reflexes: Automatic Responses (Part 4)

What You'll Learn

The heart pumps blood through blood vessels to deliver oxygen and nutrients to every cell in the body. It beats about 100,000 times per day.

Key Words

exercise
tissue

Steps

Step 1 — Read

Read and learn: The heart pumps blood through blood vessels to deliver oxygen and nutrients to every cell in the body. It beats about 100,000 times per day.

Step 2 — Do

Measure and record your data in a table.

Step 3 — Observe

Note any unexpected results.

Step 4 — Record

Share your findings with the class or a partner.

Check Your Understanding

Question 1

1 of 3

Which part of the eye focuses light?