Though Waller (1887) first recorded the electrocardiogram yet Einthoven (1903) was the real father of the electrocardiography. His method of recording E.C.G. through string galvanometer was followed until 1930 when it was largely replaced by the amplifier – driven oscillograph provided with direct ink recording. Principles upon which the string galvanometer was based are as […]
Methods of Recording Electrocardiogram (With Diagram) | Instruments | Biology
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Changes in Cardiovascular System during Exercise | Human | Biology
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In this article we will discuss about the changes which occurs in cardiovascular system during exercise. I. Heart and Exercise: Prolonged and systematic exercise causes enlargement of the heart, and this is happens only to cope with the excessive work load imposed upon the heart during work. There is a lot of misunderstanding that prolonged […]
Characteristics of Vascular Systems (With Diagram) | Human | Biology
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Histological characteristics of the different vascular systems are described below: 1. Arteries 2. Arterioles 3. Capillaries 4. Veins 5. Blood Vessels of Blood Vessels. 1. Arteries: In the arteries, all the layers (Fig. 7.14) are present. The two outer layers are very thick, because it has to withstand considerable blood pressure. The tunica media consists […]
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