A&P Chapter 16- Function of the heart
What do the venae cavae, pulmonary trunk, and aorta have in common?
All are called great vessels.
During ventricular contraction, the AV valves close to
During ventricular contraction, the AV valves close to
Which one is not a layer of the heart?
Epicardium Precordium Myocardium Endocardium
Which of the following is false regarding the myocardium?
It contains actin and myosin. It is the heart muscle. It is found in the ventricles but not the atria. It pumps the blood.
Stenosis of this valve causes left ventricular hypertrophy.
Mitral Tricuspid Pulmonic Aortic
The pacemaker of the heart is the
SA node
Purkinje fibers
are distributed throughout the ventricular myocardium
Which of the following is true of coronary blood flow?
coronary blood flow can increase. Coronary blood flow is greatest during myocardial relaxation. Coronary arteries can form anastomoses, multiple connections between the arteries. All of the above are true.
The coronary veins carry blood to the
coronary sinus
Plasma elevations of CPK, AST, LDH, and troponin are indicative of
dead myocardial cells.
When the ventricles are quivering and unable to pump blood, the condition is known as
fibrillation
Which step is next in the pathway of blood flow through the heart? Pulmonary artery to pulmonary arteries to pulmonary capillaries to pulmonary veins to
left atrium.
Abnormal heart sounds are
murmurs
The purpose of the left heart is to
receive oxygenated blood and pump it to all organs of the body.
The AV valves close in response to
rising ventricular pressure during ventricular contraction
Which statement is false regarding S1?
t is caused by the closure of the AV valves at the beginning of ventricular contraction. It is best heard over the apex. It is the first heart sound (the "lubb"). It is caused by the firing of the SA node.
Which of the following is not true about the right ventricle?
t pumps blood into the pulmonary trunk. It receives blood from the right atrium through the tricuspid valve. It contains unoxygenated blood. It is the ventricle that pumps blood to the systemic circulation.
Cardiac impulse slows as it moves through the AV node into the bundle of His. The slowing down allows
time for the ventricles to fill during the atrial contraction.
