Epinephrine activates the cyclic AMP pathway in liver cells. In this example, epinephrine is a(n) ________ and cAMP is a(n) ________.

A. enzyme; second messenger
B. first messenger; second messenger
C. ligand; receptor
D. second messenger; ion channel
E. first messenger; hydrophobic hormone


Answer: B

Anatomy & Physiology

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Successive vertebrae articulate at facets on the inferior articular processes of the superior vertebra and facets on the ________ of the adjacent inferior vertebrae

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Select the statement below that is not true with regards to the process of light adaptation

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Anatomy & Physiology

The left atrioventricular valve is also called the ____________________.

tricuspid bicuspid mitral B and C only are true none of the choices are correct

Anatomy & Physiology