Chapter 22 Flashcards
Unidirectional flow in the heart is ensured because the heart contains __________ that prevent backflow.
valves
The cells of the ___________ act as the heart’s pacemaker, which establishes the pace for cardiac activity.
sinoatrial (SA) node
Between right ventricle and pulmonary trunk
Pulmonary semilunar valve
Between left ventricle and ascending aorta
aortic semilunar valve
Between left atrium and left ventricle
bicuspid valve
between right atrium and right ventricle
tricuspid valve
The valve that prevents backflow of blood into the right ventricle is the _______ _______ valve.
pulmonary semilunar
Put the pattern of circulation into the correct order, beginning with the pulmonary circulation.
1. Blood leaves the right side of the heart.
2. Blood enters the pulmonary arteries and travels to the lungs.
3. Blood enters the left side of the heart.
4. Blood delivers oxygen to the tissues, and then enters systemic veins.
5. Blood enters the systemic arteries.
6. Blood enters the pulmonary veins
1-2-6-3-5-4
The fibers that extend through the walls of the ventricles and allow the rapid, immediate spread of the impulse throughout the ventricular myocardium are called _______ fibers.
Purkinje
True or False: Pulmonary arteries carry highly oxygenated blood.
False
Carry blood away from the heart
arteries
carry blood back to the heart
veins
Parasympathetic innervation to the heart comes from the medulla oblongata via the left and right ___________ nerves.
vagus
The external layer of the heart wall is the
epicardium
Place the locations of the heart’s conducting system in order, beginning with the location where the heartbeat is initiated.
1. Sinoatrial (SA) node
2. Purkinje cells
3. Atrioventricular (AV) bundle
4. Left and right bundles
5. Atrioventricular (AV) node
1-5-3-4-6
