PHYSCI 5 Lecture Notes - Lecture 17: Blood Vessel, Endothelium, Chylomicron
PHYSCI 5 verified notes
17/28View all
Document Summary
Chapter 7 - diseases of the heart (cardiovascular diseases) Before, we spoke of a normally functioning heart. Now, we will focus on what happens to a diseased heart (lifestyle diseases) Quick recap: the cardiovascular system has 3 components, the heart (pump), blood vessels (conduit), and blood (fluid). Blood pressure is the friction of the blood passing through the blood vessels. Blood pressure comes from the contraction of the heart - every time the heart contracts, the blood pressure increases, and when it relaxes it decreases. Hypertension: high blood pressure - when blood pressure is 140/90 or greater - may change to 135/90. Can be caused by extra sodium, stress. Higher blood pressure for a long period of time means higher friction. In people with hypertension, the constant friction will damage the endothelial cells of the inner layer of the blood vessel.
