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) second messenger.
B) intercellular enzyme.
C) hormone.
D) energy carrier.
E) target cell.
A
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Your kidneys filter your blood about _____ times per day and reabsorb _____% of the water entering the renal tubules, _____% of the electrolytes in the blood, and _____% of the glucose and amino acids that were filtered out of the blood in the glomerulus
A. 60; 99.9; 99.9; 100 B. 100; 50; 50; 99 C. 75; 100; 60; 90 D. 40; 99.9; 100; 75 E. 10; 80; 25; 70
Which mechanism prevents fish sperm from fertilizing frog eggs?
a. energetic barriers
b. biological barriers c. prezygotic barriers d. ecological barriers e. postzygotic barriers
Random planes of division in cocci result in an arrangement known as (sarcinae/staphylo/strepto)
What will be an ideal response?
A signal molecule is also known as a(n) _____.
-key -initiator -protein -receptor -ligand