. Applied physiology : including the effects of alcohol and narcotics . ich permit blood to flow toward the heart butkeep it from flowing back to the cells. Each vein runs bythe side of the artery which brought the blood to it. Sothe blood tubes are like a net hanging from tworopes. One rope is anartery, the net is thecapillaries, and the otherrope is the vein. Theblood is always movingin the tubes. We mustfind out what moves it. 117. The heart. — Ifwe follow the arteriesback, we shall see thatthey unite and grow largeruntil we reach a singletube nearly an inchthrough called the aorta. At the
. Applied physiology : including the effects of alcohol and narcotics . ich permit blood to flow toward the heart butkeep it from flowing back to the cells. Each vein runs bythe side of the artery which brought the blood to it. Sothe blood tubes are like a net hanging from tworopes. One rope is anartery, the net is thecapillaries, and the otherrope is the vein. Theblood is always movingin the tubes. We mustfind out what moves it. 117. The heart. — Ifwe follow the arteriesback, we shall see thatthey unite and grow largeruntil we reach a singletube nearly an inchthrough called the aorta. At the d ventriclebeginning of the aorta isa pump called the heart lies just to the left of the middle of the body, and just below the levelof the armpits. It is a bag about the size of the inside is divided so as to make two bags. Each bagis a complete pump. The lower part of each side of theheart is called a ventricle, and the upper part an are two openings in each ventricle. A hole inits upper part leads to the auricle. It can be closed. Diagram of the heart while it is beating. a vein entering the auricle. This artery is c closed valve to keeP blood fr°m flowing back into the auricle. e artery. f valve to keep blood from returning to theventricle. 64 APPLIED PHYSIOLOGY tightly by two curtains. A hole in its side opens into anartery. When the ventricle is full of blood, all at once it becomessmaller and squeezes the blood. The pressure closes theopening to the auricle and keeps the blood from going outthat way, and so it passes into the artery. Three littlecurtains keep it from running back into the heart keeps the arteries full of blood, and pressesit through their branches and through the capillaries andveins. It finally reaches the heart again and flows intothe auricles. Then it flows into the ventricles again, readyfor another round of the body. The sides of the auricles are thin, for they are madeonly to hold the ret
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