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The physiology of the heart and circulation. It describes the capillaries, the circulation, and the properties of the myocardium. It also explains the cardiac action potential and the cardiac cycle. useful for students studying physiology, anatomy, and medicine.
Typology: Summaries
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System Nervous : III.1.2.3. Capillaries Are tiny blood vessels, 50 times smaller than a hair, connecting arteries and veins together. Blood flows through them very slowly, allowing exchanges between the blood and the cells. Oxygen and nutrients are delivered to the cell while waste products from the cell are collected by the blood. III.2 The circulation The heart is in fact a double pump: one pump, the right heart. The other, the left heart. Each of the pumps has specific functions:
Propagation to the atria which contract en bloc. Relayed by the atrioventricular node, reaches both ventricles through the His bundle and the Purkinje network (figure 33). III.3.2. The cardiac action potential III.3.2.1. The electrocardiogram Any working muscle is the site of a depolarization wave, i.e. a current that can be recorded by two judiciously placed electrodes (figure 34). The heart, like any other muscle, produces a current. Because of its crucial role in the body and the complexity of its functioning, the electrical study of the heart, or electrocardiography, has become very important in cardiac physiology and pathology. The electrocardiogram is the result of recording the electrical activity of the heart, studied from <