Embryonic Truncus Arteriosus
orgin of both the aorta and pulmonary artery
Arteries have how many layers
inner layer single cell thickness of endothelial cells
middle layer of arteries, thicker muscle layer
Outer layer of the arteries, white fibrous layer
As arteries branch out they become smaller
Two layer walls Tunica media and Intima
Branch out even smaller than arterioles, have the ability to expand and contract based on blood supply needed in the area.
Has only intima as there walls
Aorta ability to act as a compression chamber or reservoir for blood due to distensibility and compliance when rapid ejection form the lv occurs, it effects diminish with aging
Carries oxygenated blood away from the heaart during lv systole
6 divisions of the aorta
Sinuses of Valsalva, AS, transverse AA, AD, thoracic and abdominal aorta
___ ____ becomes the abdominal aorta after it penetrates the diaphragm
Aortic Arch has three main branches
Brachiocephalic artery, Left common carotid and left subclavian artery
returns deoxygenated blood to the lungs, it begins at the pulmonic valve level where bifurcates into the r and l pulmonary arteries a few cm from its orgin
thinner walls in adults with pressure approximatly one sixth of systemic circulation in the normal adult heart
Pulmonary capillary pressure at rest
Systemic capillary pressures
Larger than the normal Coronary sinus
Lies inferior to the LA and the region of the Atrioventriclar groove and lies outside the pericardial shadow
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