difference between vessels that collect and distributed blood
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Aorta - Pulse dampening and distribution
Large Arterioles - Distribution of arterial blood
Small Arteries - Distribution and resistance
Arterioles - Resistance (pressure & flow regulation)
Capillaries - Exchange of blood
Venules - Exchange, collection, and capacitance
Vein - Capacitance function (blood volume)
Vena Cava - Collection of venous blood
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The left ventricle ejects blood into the aorta, which then distributes the blood flow throughout the body using a network of blood vessels. Just beyond the aortic valve in the ascending aorta, there are small openings (left and right coronary ostia) from which arise the left and right coronary arteries that supply blood flow to the heart muscle. Near the top of the aortic arch, there are three major arteries that distribute blood flow to the upper thorax, arms and head. The first is the brachiocephalic artery, which shortly branches into the right subclavian artery (supplies the upper thorax, right arm and head) and right common carotid artery (supplies head). The next branch from the aortic arch is the left common carotid artery, which also supplies the head. The third major artery arising from the aortic arch is the left subclavian artery, which supplies blood flow to the upper thorax, left arm and head. Past the arch, the aorta descends downward (descending aorta) through the thorax (thoracic aorta) where it gives off several small arterial vessels to supply blood flow to the thorax. When the aorta passes through the diaphragm, it continues as the abdominal aorta. Several major arteries branch from the abdominal aorta, including those that supply blood to the visceral organs (e.g., stomach, intestines, kidneys). In the lower abdomen, the aorta bifurcates into the left and right common iliac arteries, which supply blood to the pelvic region and the legs via additional bifurcations and branches.
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