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Ventricular relaxation phase of the cardiac cycle, dilation state of the heart, the rest between systoles
the two lower chambers of the heart, and they pump blood out to the lungs and body (thick walled chambers)
The heart has ________? Which are: Right atrium, left atrium, right ventricle, left ventricle
(General Circulation) carries blood from the heart and throughout all parts of the body
(Cardiopulmonary Circulation) Carries blood from the heart to the lungs and back to the heart
Apex of the heart
(Conical tip) lies on the diaphragm and points to the left of the body. It is here where the heartbeat is most easily felt and heard through the stethoscope.
Total volume of blood ejected from the heart per minute
Stroke volume X Heart Rate = Cardiac Output
60 ml X 80= 4,800 ml/min
Covering of the heart, loose fitting double layer sac that encloses the heart
(pericardial fluid) Fluid between the parietal pericardium and visceral pericardium which prevents friction as the heart beats
Middle layer of the heart, made of cardiac muscle, Contains the septum (thick muscular wall that completely seperates the blood on the right side from blood on the left side of the heart)
Smooth inner lining, permits blood to move easily through the heart without agglutinating (Clumping)
Pump during working phase of the heart cycle
Right Ventricle pumps blood into the lungs
Left Ventricle pumps blood to the tissues of the body
large venious blood vessels which bring deoxygenated blood to the right atrium from all parts of the body
Heart Blood Flow
The heart has 4 valves which permit the blood flow in one direction only, these valves open and close during the contraction of the heart, preventing the blood from flowing backwards
small fibrous strands connecting the edges of the tricuspid valve to the papillary muscle that are projections of the myocardium
1st heart sound (S1) Sound made when the tricuspid and bicuspid (mitral) AV valve closes between the atria and ventricles (systole)
2nd heart sound (S2) Cause by the semilunar valves in the aorta and the pulmonary arteries closing (diastole)
(Pericardial Fluid) Fluid between the parietal pericardium and the visceral pericardium which prevents friction as the heart beats.
Heart Conduction Sequence
SA Node, AV Node, AV Bundle, Bundle Branches, Purkinje fibers, contraction of myocardium
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