When the hormone epinephrine binds to receptors on the surface of a heart muscle cell, a new molecule, called cyclic AMP, is produced. Cyclic AMP then causes the heart muscle cells to contract more strongly, increasing blood flow throughout the body. In this example, cyclic AMP is acting as a(n)
A) target cell.
B) intercellular enzyme.
C) energy carrier.
D) second messenger.
E) hormone.
Correct Answer:
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Q5: Endocrine glands secrete their products
A) into a
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A) chemicals released by cells into
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Q9: Testosterone is made in the testes, where
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A) Modified fatty acids
B) Peptides
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A) chemicals secreted through
Q13: Local hormones are
A) released from a nerve
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