Cardiovascular System Study Notes

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Heart located in the Located in mediastinum between lungs

Epicardium - serous membrane covering heart
Myocardium thick muscular layer of heart wall - provides attachment for cardiac muscle

Endocardium smooth inner lining of heart wall smooth

Right and left atria 2 superior chambers receive blood returning to heart.

Right and left ventricles
2 inferior chambers pump blood into arteries

AV valves Ensure one-way blood flow

Atrioventricular (AV) valves
tricuspid valve - between right atrium & ventricle mitral or bicuspid valve - between left atrium & ventricle

Chordae tendineae (cords) connect AV valves to papillary muscles on the floor of ventricles

Semilunar valves
pulmonary - at ))))))))) to pulmonary artery aortic - at entrance to aorta

HEART IS CONE SHAPED AND IN THE MEDIASTINUM LOCATED IN _ THORACIC CAVITY

THE PERICARDIUM IS COMPOSED OF AN OUTER FIBROUS MEMBRANE AND A DOUBLE WALLED SEROUS MEMBRANEOUS SAC

THE OUTER FIBROUS MEMBRANE IS ATTACHED TO THE DIAPHRAGM _AND THE BLOOD VESSELS THAT ARE ATTACHED TO THE HEART.

THE CAVITY BETWEEN THE TWO PERICARDIAL SEROUS MEMBRANES IS CALLED THE _ PERICARDIAL CAVITY AND IS FILLED WITH SEROUS FLUID.

THE OUTER LAYER OF THE PERICARDIAL CAVITY IS PARIETAL AND THE INNTER LAYER IS VISCERAL

EACH ATRIUM HAS A SAC LIKE EXTENSION CALLED AURICLE

A CORONARY SULCUS EXISTS BETWEEN THE ATRIA AND THE VENTRICLES OF THE HEART. ACCOMODATES BLOOD VESSELS CALLED THE CORONARY SINUS THAT DRAINS THE HEART WALL AND BRANCHES OF THE CORONARY ARTERY THAT SUPPLY THE HEART WALL WITH BLOOD

THE INFERIOR AND SUPERIOR VENA CAVA ALLOW DEOXYGENATED BLOOD FROM ALL SYSTEMS OF THE BODY TO FLOW INTO THE RIGHT ATRIUM

THE PULMONARY VEINS ALLOW OXYGENATED BLOOD FOR THE LEFT AND RIGHT LUNGS TO FLOW INTO THE LEFT ATRIUM

THE AORTA HAS 3 SECTIONS: 1THE ASCENDING AORTA THRU WHICH OXYGENATED BLOOD FLOWS UPWARD.2 THE AORTIC ARCH WHICH CURVES TOWARD THE POSTERIOR REGION OF THE THORAX AND 3 DESCENDING AORTA...
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