The role of the atrioventricular node (AV node) is to:
a. initiate a sinus rhythm.
b. initiate ventricular depolarization.
c. slow down impulses so that the atria can contract to fill the adjacent ventricles with blood.
d. conduct impulses to the sinoatrial node (SA node).
Answer: c. slow down impulses so that the atria can contract to fill the adjacent ventricles with blood.
You might also like to view...
Which carries oxygenated blood from the lungs to the heart?
A. Pulmonary arteries B. Pulmonary veins C. Pulmonary trunk D. Inferior vena cava E. Superior vena cava
Which cells secrete highly alkaline mucus to protect the stomach walls from the hostile environment caused by the acid and digestive enzymes produced in the stomach?
A. Chief cells B. Endocrine cells C. Mucous cells D. Parietal cells
The ________ secretes triiodothyronine.
A. parathyroid gland B. pancreas C. thyroid gland D. adrenal gland
Neurons that have only two processes attached to the cell body are called
a. unipolar. b. bipolar. c. multipolar. d. efferent.