Anatomy > Questions Only > A&P 2 Lab 4 AP lab4
Circulatory System-Blood Flow Tracings Circulatory system- how the blood from the heart is circulated throughout the body. General blood flow through the body after it leaves the heart follows a mapping system. From the heart, it flows through arteries, then capillaries, and comes back to the hea ... rt by way of veins. BLOOD VESSELS IN THE CIRCULATORY SYSTEM: Arteries- referred to as efferent blood vessel in the circulatory system o They always carry blood away from the heart. o Typically carry oxygenated blood. (except in the pulmonary artery) o 1. Conducting arteries: very large arteries and typically exit from the heart They have the need/ability to expand when the heart beats so they withstand the splurge. So, with every heartbeat, blood surges out of the heart into these large vessels. To do this, they must have a layer of elastic tissue that gives it the ability to stretch and recoil when the heart is relaxing. EX: aorta and pulmonary trunk o Atherosclerosis- when arteries age and stiffen because plaque builds up in the arteries, they loose that elasticity and the ability to stretch when blood surges into them. It results in an increase in pressure in those vessels which can lead to an aneurism- a weak point in a artery and with each heartbeat, that little thin walled area will pulsate and it can further and further weaken and eventually rupture which can lead to death or stroke. o 2. Distributing arteries: A.k.a. medium or muscular arteries They are direct branches from the conducting arteries Have a very thick muscular wall (up to 40 layers of smooth muscle) The muscular wall in a distributing artery makes up 75% of the arterial wall itself. EX: brachial artery, femoral artery (named for area where they are distributing their blood) o 3. Resistance arteries: A.k.a. small arteries Too numerous to name o 4. Metarterioles: Very short vessels that will link the arteriole system to the capillaries. AFTER BLOOD FLOWS THROUGH THE ARTERIAL SYSTEM, IT THEN FLOWS INTO A SERIES OF CAPILLARY BEDS. [Show More]
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