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33 Cards in this Set

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The continuous one-way circuit of blood through the body in the bolld vessels
Circulation
Location of the heart
Between the lungs and a bit to the left of the midline of the body
The pointed, inferior portion of the heart
Apex
A thin, smooth layer of epithelial cells that lines the heart's interior
Endocardium
The heart muscle, the thickest layer, pumps blood through the vessels
Myocardium
A serous membrane that forms the thin, outermost layer of the heart wall
Epicardium
The sac that encloses the heart
Pericardium
The outermost, heaviest layer of the pericardium
Fibrous pericardium
Two layers of the pericardium serous membrane
Parietal layer - outer
Visceral layer - inner
Upper chambers of the heart
Atria
Blood-receiving chambers of the heart
Atria
Lower chambers of the heart
Ventricles
A thin-walled chamber that receives the blood returning from the body tissues
Right atrium
Pumps the venous blood received from the right atrium to the lungs
Right ventricle
Receives blood high in oxygen content as it returns from the lungs in pulminary veins
Left Atrium
The chamber with the tickest wall; pumps oxygenated blood to all parts of the body
Left Ventricle
Partions which completely separate the heart's chambers; consist largely of myocardium
Septum
Separates the two atria
Interatrial septum
Separates the two ventricles
Interventricular septum
Valve with three cusps; located between the right atrium and right ventricle
Right Atrioventricular valve (tricuspid valve)
Valve with two cusps; located between the left atrium and left ventricle
Left Atrioventricular valve (mitral valve)
Valve with three half-moon cusps; located at the entrance to the pulmonary artery
Pulmonary semilunar valve
Valve with three half-moon cusps; located at the entrance to the aorta
Aortic semilunar valve
A dialated vein that opens into the right atrium near the inferior vena cava
Coronary sinus
Special features of the myocardium
Lightly striated Intercalated disks Branching of fibers
First branches of the aorta; fill when heart relaxes
Coronary arteries
Collect venous blood from the heart and empties into the right atrium
Coronary sinus
Phases of the cardiac cycle
Diastolic - relaxation phase
Systolic - contraction phase
Volume pumped by each ventricle per minute
Cardiac output
Amount pumped with each beat
Stroke volume
Number of beats per minute
Heart rate
Node that initiates the heartbeats by generating an action potential at regular intervals; located in the upper wall of the right atrium
Sinoatrial node (pacemaker)
Node located between the atria and ventricles
Atrioventricular node