Receptors are specifically designed to bind to body substances. Which of the following is NOT one of those body substances?
A) enzymes
B) hormones
C) neurotransmitters
D) antigens
Answer: D
A) Enzymes are body substances that bind to receptors.
B) Hormones are body substances that bind to receptors.
C) Neurotransmitters are body substances that bind to receptors.
D) Antigens are foreign substances, not body substances.
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