The physiology and hygiene of the house in which we live . Diagram op ttie Large Vessels of the Heart and Lungs (from Wilson). 1. .Ascending aorta. 2. Transverse portion of the arch. 3. Thoracic or descending aorta. 4. Arterla innominata. 5. Right common carotid. 6. External and internal carotids. 7. Right subclavian artery. 8. Axillary artery. 9. Brachial artery. 10. Right pneumosastrlc nerve. 11. Left common carotid. 12. Left subclavian artery. 13. Pulmonary artery. 14. Left pulmonary artery. 15. Right pulmonary artery. 16. Trachea. 17. Right bronchus. 18. Left bronchus. 19. 19. Pulmonary ve
The physiology and hygiene of the house in which we live . Diagram op ttie Large Vessels of the Heart and Lungs (from Wilson). 1. .Ascending aorta. 2. Transverse portion of the arch. 3. Thoracic or descending aorta. 4. Arterla innominata. 5. Right common carotid. 6. External and internal carotids. 7. Right subclavian artery. 8. Axillary artery. 9. Brachial artery. 10. Right pneumosastrlc nerve. 11. Left common carotid. 12. Left subclavian artery. 13. Pulmonary artery. 14. Left pulmonary artery. 15. Right pulmonary artery. 16. Trachea. 17. Right bronchus. 18. Left bronchus. 19. 19. Pulmonary veins. 20. Bronchial arteries. 21. 21. Intercostal arteries; the branchesfrom the front of the aorta above andbelow the number 3 are pericardiacand esophageal. •. Physiology and Hygiene. CHAPTER V. SEWERAGE AND VENTILATION. In the preceding chapter we have briefly considered thecomposition of the blood and the mechanism of its circula-tion. This naturally brings us to the question, Why is theblood thus carried its ceaseless round ? Because if delayedat any one point the blood there stagnates, grows blue, dis-tends the tissues, and finally, by an escape of its corpuscles,produces death of the part. Such an accident is called in itsearlier stages congestion, later it is known as happens whenever the nerves which preside overthe circulation of any organ fail to do their duty; for eachtiny arterial twig has its own nerve connections which regu-late the quantity of blood contained by contracting or dilat-ing the vessel as required. The pallor of fainting means thatthere has been a sudden contraction of the little vessels uponthe surface of the body, driving the blood to the internal or-gans. Blushing denotes exactly the cont
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