DK Find Out! Heart and Blood
DK

The heart, blood, and blood vessels form the body’s transport system.

DK Find Out! Lungs and Breathing
DK

The cells in your body can’t survive without a continual supply of oxygen from the air.

Illuminations: How Big is Your Heart?
Illuminations (National Council of Teachers of Mathematics)

This lesson emphasizes the connections between science and mathematics by using a performance, or authentic, assessment format.

But Why?: How Does Your Heart Work?
But Why?

Pediatric cardiologist Dr. Jane Crosson from Johns Hopkins Hospital answers questions about the heart.