science education resource

For K-12 Students • Educators • Homeschool Families • Naturalists

contraction

To view these resources with no ads, please Login or Subscribe (and help support our site).

When something squeezes down smaller. In muscles, a contraction shortens the muscle, usually bending a joint for movement. When the heart muscle contracts, it sends blood circulating throughout the body.
Exploringnature.org has more than 2,000 illustrated animals. Read about them, color them, label them, learn to draw them.