Reflexes: Automatic Responses

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.

Step 1 — Read

Review the background information on The Human Body before starting.

Step 2 — Do

Investigate fingerprints: press your fingertips on an ink pad and stamp them on paper. Classify each as a loop, whorl, or arch.

Step 3 — Observe

Note any unexpected results and think about why they happened.

Step 4 — Record

Share your findings with the class or a partner and discuss what you learned.

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Which part of the eye focuses light?