The Heart and the Circulatory
The Heart and the Circulatory SystemImagine that you are living in the year 1535, and that you don't feel well. You have had some problems with fatigue, feeling a little more tired than usual when you walked to the market and back. You tell this to your physician, and he sends you to another physician down the street, telling you there may be some problem with your circulation. When you get to the new physician, he tells you to take off your shirt and lie down on the bench. After a quick look in your mouth, he says your vital blood is probably O.K. But he's concerned that maybe your nutritive blood is not being made fast enough. Then he starts to feel around on your abdomen. He mentions that your liver is slightly enlarged and suggests that maybe you have not been eating enough green leafy vegetables or protein. Wait a minute! You have come in with problems with your circulation, and this guy is talking about your liver and the type of foods you have been eating! What is going on here? Where did this fellow learn to practice medicine anyway? Confusion over the nature of the heart, the blood, and the role of the blood in the body had existed for centuries. Pliny the Elder, a Roman writer who lived from AD 23-
A physician listening carefully to the heart can detect if the valves are closing completely or not. Next, another catheter with a balloon near the end is run along the guide wire. While you might think the heart would have no problem getting enough oxygen-rich blood, the heart is no different from any other organ. Most physicians of the time felt that the lungs were responsible for moving the blood around throughout the body. This disease is a killer and there are a great number of things that can be pointed to that cause it. As the bulb is squeezed, it forces the water along to the bucket. He did not know that the blood left each ventricle through arteries. The result can be blood damming up behind the valve. Even our modern society continues to put emotions under the control of the heart, speaking of having a broken heart when a loved one leaves, or stealing one's heart around Valentine's Day. Valvular stenosis is the result of diseases such as rheumatic fever, which causes the opening through the valve to become so narrow that blood can flow through only with difficulty. Scientific research has replaced mystical spirits as the basis for medical practice. When you look at a heart, you see that the right side of the heart is distinctly smaller than the left side, and the left ventricle is the largest of the four chambers.
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