Physiology 1020 Lecture Notes - Lecture 9: Elastic Fiber, Osmosis, Vasomotor Center
8 Dec 2016
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Document Summary
Closed system of blood vessels: arteries and arterioles: transport blood away from the heart, capillaries: where gas exchange occurs, venules and veins: return blood back to the heart. Pulmonary circuit: begins on the right side, sends blood through pulmonary arteries to lungs to pick up o2 and drop off co2, sent back through veins and returns to the left side. Tbv= 5l: 70% is contained in veins (blood reservoir, 10% is contained in arteries, 15% contained in the heart and lungs, 5% contained in capillaries. Arteries: high pressure and low cross- sectional area (fast blood flow) Capillaries: low pressure and high cross- sectional area (slow blood flow) Veins: low pressure and low cross-sectional area (allows for storage of majority of blood) Blood flows through blood vessels as a laminar (streamlined) flow down ots pressure gradient (high low: the higher the pressure gradient, the higher the blood flow.
