CHEM 183 Lecture Notes - Lecture 8: Pulmonary Valve, Tricuspid Valve, Pulmonary Vein
23 Oct 2018
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Document Summary
Heart disease #1 killer in north america takes decades for problem to develop can take cautionary measures. Muscle in center of chest cavity egyptians thought heart was center of emotions and intellect- didn"t think much of the brain. Romans heart made blood and pumped it through arteries to deliver vital spirit - gladiators- open injury to chest with a still beating heart examinable. Credit of explaining how heart works and circulates blood around body william harvey (1578)-1657) 17th century, by then they were familiar with 4 chambers. Heart pumps 5-6 liters of blood every minute through 100,000 km of blood vessels beating up to. 2. 6 billion times through a lifetime- requires constant source of oxygen. Impairment of electrical activity- what tells chambers of heart to beat. Improper functioning of heart valves- if they don"t open and close properly coordinated, not enough transport of oxygen in body. Smoking greater risk factor for heart disease than it is for lung cancer.
