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Module 10 A&P

Cardio

TermDefinition
the heart is approx. size of a fist
Base broadest part of the heart
Apex point of maximum impulse
pericardium doubled wall sac around the heart
Pericardial cavity space that contains serous fluid to prevent friction as the heart beats
epicardium thin layer of squamous epithelial cells that covers the surface of the heart
myocardium cardiac muscles that performs the work of heart
endocardium thin layer of squamous epithelial cells that lines chamber of heart, prevents blood clot formation
superior and inferior vena cavae supply blood to the right atrium
left ventricle has thickest and strongest walls because it must generate enough force to push blood throughout the body
Cusps or Leaflets flaps of tissue that form valves
valves open and close in response to... pressure changes in heart
two artioventricular valves (tricuspid & bicuspid) regulate flow between atria and ventricles
valves prevent backflow into the ventricles
Pulmonary valve located between the right ventricle and the pulmonary artery
aortic valve located between the left ventricle and aorta
tricuspid valve located between the right atrium and right ventricle
Mitral valve located between the left atrium and left ventricle
Right coronary artery supplies blood to the right atrium most of the right ventricle and parts of the left atrium and ventricle
coronary arteries receive their blood supply when the ventricles relax
cardiac conduction SA node, fibers conduct impulses to left atrium, AV node, Bundle of HIS, right and left bundles branches, purkinje fibers
Automaticity the hearts ability to initiate its own electrical impulse
SA node fires at 60-80 beats per minute, hearts pacemaker, if fails another area will imitate heartbeat
AV node impulse from SA node slows here to give atria time to contract completely and ventricle to fill with blood, firing rate 40-60 beats a minute
cardiac cycle the series of events from the beginning of one heartbeat to the beginning of the next
cardiac output heart rate x stroke volume
medulla cardiac center in the brain
ejection fraction percentage of ventricles eject 60% to 80% of blood volume
Created by: Kylee_cheyenne