anatomy 2 pearson chapter 18 cardiovascular heart
diastole
relaxation
circumflex artery
supplies blood to the left atrium and posterior walls of the left ventricle
Which of the following is a difference between cardiac muscle and skeletal muscle?
unlike skeletal muscle cells, cardiac cells can be auto rhythmic
mitral (bicuspid) valve
valve between the left atrium and the left ventricle
tricuspid valve
valve between the right atrium and the right ventricle
aortic semilunar valve
prevents backflow of blood into the left ventricle
The superior chambers of the heart are called the __________.
atria
The P wave of an electrocardiogram represents __________.
atrial depolarization
The second heart sound (the "dup" of "lub-dup") is caused by the __________.
closure of the semilunar valves
systole
contraction
Which of the following are correctly paired?
ectopic focus: an abnormal pacemaker
The lining of the heart chambers is called the __________.
endocardium
Which of the following is NOT a role of the fibrous pericardium?
it facilitates heart contraction
Into which chamber of the heart do the pulmonary veins deliver blood?
left atrium
Freshly oxygenated blood is delivered to the __________, and then it passes into the __________ to be pumped to the body tissues (systemic circuit).
left atrium; left ventricle
The most muscular chamber of the heart is the __________.
left ventricle
Which of the following would lead to a decrease in heart rate?
parasympathetic stimulation
pulmonary semilunar valve
prevents back flow of blood into the right ventricle
posterior interventricular artery
runs to the apex of the heart
The role of the atrioventricular node (AV node) is to __________.
slows down impulses so that the atria can contract to fill the adjacent ventricles with blood
anterior interventricular artery
supplies blood to the inter ventricular septum and anterior walls of both ventricles
right marginal artery
supplies blood to the lateral right side of the myocardium
stroke volume
the volume of blood pumped by one ventricle with each heartbeat
In the fetus, blood from the left and right sides of the heart normally mix.
true
cardiac output
the amount of blood pumped by each ventricle in one minute
cardiac cycle
the events associated with the blood flow through the heart during one complete heartbeat