The essentials of healthA text-book of anatomy, physiology, hygiene, alcohol, and narcotics . Fig. 31. A diagram illustratingthe flow of blood through the heart:(1) and (2) veins; (3) right auricle ;(4) right ventricle ; (5) pulmonary ar-tery ; (6) pulmonary veins; (7) leftauricle ; (8) left ventricle ; (9) aorta. THE CIRCULATION. 109. Fig. 32. A cross section of the ventricles ofthe heart. The Left Ventricle Stronger than the Right. The leftventricle has to contract with force sufficient to send theblood to the most distant parts of the body ; while theright ventricle has to send the blood on
The essentials of healthA text-book of anatomy, physiology, hygiene, alcohol, and narcotics . Fig. 31. A diagram illustratingthe flow of blood through the heart:(1) and (2) veins; (3) right auricle ;(4) right ventricle ; (5) pulmonary ar-tery ; (6) pulmonary veins; (7) leftauricle ; (8) left ventricle ; (9) aorta. THE CIRCULATION. 109. Fig. 32. A cross section of the ventricles ofthe heart. The Left Ventricle Stronger than the Right. The leftventricle has to contract with force sufficient to send theblood to the most distant parts of the body ; while theright ventricle has to send the blood only to the lungs,which are but a shortdistance from , we shouldexpect to find theleft side of the heartstronger ; that is, itsmuscular wallsshould be this case we arenot disappointed, fora cross section ofthe heart through the ventricles appears as illustratedin Fig. 32. This shows the relative thickness of thewalls of the ventricles in their contracted state, andalso the difference in the shape of the ventricles. Tothe right of the figure is the nearly circular cavity ofthe left ventricle, surrounded by thick walls. To theleft is the flattened cavity of the right ventricle, withmuch thinner walls. The Pulsations of the Heart. The beat of the heart isinvoluntary and subject to much variation. The aver-age
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectphysiology, bookyear1
