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