Chapter 19 Blood Vessels Part1

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6 жыл бұрын

Пікірлер: 15

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@caitlynnichols3632 6 жыл бұрын

Thank you so much!!! These videos are so helpful. Why do large-diameter lumens offer little resistance? I am having difficulty understanding the resistance concept.

@kimberlystewart9800 4 жыл бұрын

Caitlyn Nichols Hi. Listen to 7:24 - 8:51 again. The large diameter arteries need to be able to accommodate/accept/receive the blood as it is pumped under high pressure from the heart. If they didn’t stretch then the resistance to flow from the heart would be too high. The heart would be over worked all of the time and less blood would actually be expressed from the heart. Coronary artery disease is this very scenario. The aplastic vessels also need to be able to reshape/snap back so that blood pressure is stabilized and flow is maintained during relaxation/diastole. This is my take anyway...