A substance that enters into a chemical reaction is called a(n) . catalyst
enzyme
product
reactant

The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products.

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Explanation:

hormones in blood stream

image: dtc.ucsf.edu

endocrine glands secrete hormones into the blood stream near them; the hormones then travel in our bloodstream until it reaches its destination, called a target cell, in distance parts of the body. in the target tissue, hormones lock onto the target’s plasma membrane, called the receptor site.

21 stacks

step-by-step explanation:

divide 630/30

21 stacks

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