Different Cells Respond Differently to the Same Messengers

question 72

Multiple Choice

Different cells respond differently to the same messengers. For example, epinephrine binding activates glycogenolysis in skeletal muscle but increases of strength of contraction in the heart. What must be true in order to explain this difference?

• A) the cells must have different types of adrenergic receptors
• B) the cells' receptors must have different affinities for epinephrine
• C) the cells must express different sets of effector proteins
• D) the cells' receptors must have different saturation points for epinephrine

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