Anatomy and Cell Biology 3309 Lecture Notes - Lecture 18: High-Pressure Area, Lymphatic Vessel, Pulmonary Artery
19 Aug 2019
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15-hour flight, get swollen ankles bc you are not using your musculature to move the venous flow back up to the heart lymphatic flow is also dependent on movement. Elastin will store that energy and return to its normal size during diastole (heart relaxing) & maintain pressure. This is why our blood pressure ranges from 120-80: when heart stops the contraction, don"t have drop of pressure to 0 bc have energy stored in the stretched elastin. Elastin is contracting during diastole, keeping up the pressure on the blood so it continues to flow. The pressure only drops down to 80 due to elastin forces. Continuous flow of blood, but pulsatile because it varies in its pressure: muscular (distributing) arteries. Thick layer of smooth muscle is under the control of the ns and hormones. Control their diameter thru hormonal release or direct innervation on the sympathetic side.
