This system defends the body against infections

This system detects, signals, and responds to changes in the environment

The organs in the digestive system include

A nutrient used for quick energy is a

The part of the digestive system that ingests food is the

Iron and calcium are examples of

Blood is transported TO the heart through

The left ventricle sends oxygen-rich blood

The heart is a(n)

Oxygen enters your body when you

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