A &P chapter 18
The events associated with blood flow through the heart during one complete heartbeat
Cardiac cycle
The role of the atrioventricular node (AV node) is to:
slow down impulses so that the atria can contract to fill the adjacent ventricles with blood.
The vessel layer that has a direct role in vasoconstriction is the:
tunica media
Into which chamber of the heart do the pulmonary veins deliver blood?
Left atrium
The lining of the heart chambers is called the:
endocardium.
Supplies blood to the right side of the myocardium
Right marginal artery
he amount of blood pumped by each ventricle in one minute
Cardiac output
Valve between the right atrium and right ventricle
Tricuspid valve
Supplies blood to the interventricular septum and anterior walls of both ventricles
Anterior interventricular artery
Gatekeeper to systemic circuit
Aortic semilunar valve
Supplies blood to the left atrium and posterior walls of the left ventricle
Circumflex artery
Relaxation
Diastole
Which is correctly paired?
Ectopic focus: an abnormal pacemaker
Which of the following would lead to a decrease in heart rate?
Parasympathetic stimulation
Which of the following is not a role of the pericardium?
It facilitates heart contraction.
Valve between the left atrium and left ventricle
Mitral valve
Runs to the apex of the heart
Posterior interventricular artery
Prevents backflow of blood into the right ventricle
Pulmonary semilunar valve
. The volume of blood pumped by one ventricle with each heartbeat
Stroke volume
Contraction
Systole
Which of the following is a difference between cardiac muscle and skeletal muscle?
Unlike skeletal muscle cells, cardiac muscle cells can be autorhythmic.
In the fetus, blood from the left and right sides of the heart normally mix.
True
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:
closure of the semilunar valves.
Freshly oxygenated blood is delivered to the _____ and then it passes into the _______, to be pumped to the entire body.
left atrium; left ventricle
The most muscular chamber of the heart is the ________.
left ventricle
