A key influence of the atrioventricular node on the heartbeat is to
A. speed up the conduction of the electrical impulse to contract as it passes from the atria to the ventricles.
B. slow down the conduction of the electrical impulse to contract as it passes from the atria to the ventricles.
C. act as a barrier that prevents the conduction of the electrical impulse to contract as it passes from the atria to the ventricles.
D. not alter the speed at which the electrical impulse to contract passes from the atria to the ventricles.
E. block backflow of blood from the aorta into the right ventricle.
B. slow down the conduction of the electrical impulse to contract as it passes from the atria to the ventricles.
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Refer to Figure 49-1. Which of the following would bind to an intracellular receptor?
a. 1
b. 3
c. 6
d. 8
e. 10
Which provides the most direct evidence for evolution?
a. biogeography b. the fossil record c. molecular biology d. convergent evolution e. comparative anatomy
Water molecules are polar with ends that exhibit partial positive and negative charges. These opposite charges allow water molecules to attract each other through:
A. peptide bonds. B. ionic bonds. C. hydrogen bonds. D. covalent bonds.
The production of red blood cells is stimulated by _____
A) low-density lipoproteins B) immunoglobulins C) erythropoietin D) epinephrine