The ventral shell of a turtle is known as the carapace. Enamel is a hard, smooth covering protecting the crown of a tooth. Incisors are shaped for puncturing and tearing. Animals with horns shed them every year. The gastrocnemius is the muscle that extends the forearm.
Arteries carry blood under high pressure.
The walls of capillaries are only one cell thick. The lifespan of a red blood cell is about 120 days. Impulses travel through nerves because of ions. Latitude describes locations north or south of the equator. The highest elevation in Oklahoma is in the southeast corner of the state.