9781422269886

WORDS TO UNDERSTAND

Circulatory System: The system that circulates blood throughout your body. It includes the heart and blood vessels. Enzymes: Proteins made in the body that speed up chemical reactions in the body. Inflammation: Swelling and/or redness in an area triggered by the body’s natural response to injury or sickness. Regenerate: To regrow new tissue. Underestimate: To think of something as less (e.g., less important) than it really is.

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