. Physiology, experimental and descriptive . king off the bottom of the jar, file theedges so they will not cut the rubber. Let each pupil make a drawing, showing the position ofthe parts in Inspiration and in Expiration. Action of the Walls of the Chest To show the ac-tion of the chest walls, take a pair of bellows, and stop the 112 MINUTE STRUCTURE OF LUNG. hole in the side. Now, when the handles are separated, airenters the nozzle, and when the handles are brought togetherair is driven out. If a rubber balloon be tied to a glass tubetightly corked in the nozzle of the bellows, and then the
. Physiology, experimental and descriptive . king off the bottom of the jar, file theedges so they will not cut the rubber. Let each pupil make a drawing, showing the position ofthe parts in Inspiration and in Expiration. Action of the Walls of the Chest To show the ac-tion of the chest walls, take a pair of bellows, and stop the 112 MINUTE STRUCTURE OF LUNG. hole in the side. Now, when the handles are separated, airenters the nozzle, and when the handles are brought togetherair is driven out. If a rubber balloon be tied to a glass tubetightly corked in the nozzle of the bellows, and then the bel-lows are worked, air will enter and inflate the balloon whenthe handles are separated, and air will rush out when thehandles are brought together. If the sides of the bellowshave a tight window, the changes in the balloon can be seen. To illustrate the minute anatomy of the lung, take a rubberballoon, a glass tube, two rubber tubes, one dyed red, the otherblue, a bag of netting, with one side dyed red and the other CILIA BRONCHIAL Fig. 44. Minute Structure of the Lungs, Shaming Air Vesicles andCapillaries. side blue. Tie the balloon on the end of the glass tube, slipthe bag of netting over the balloon, and tie it, with the ends ofthe rubber tubes on the corresponding sides of the bag. Slipa short piece of the rubber tube on the end of the glass tube,and when the balloon is inflated shut the air in by means of apinchcock. The balloon represents an air vesicle, the glass MOVEMENTS OF RESPIRATION. 113 tube a bronchial twig, the blue tube a subdivision of the pul-monary artery, the netting the capillaries around the vesicle,and the red tube one of the branches of the pulmonary veins. That the lungs do not collapse after death may be shownin a cat or rabbit. Open the abdominal cavity, and pull backthe liver and stomach. The pink kings may be seen throughthe thin diaphragm. Pull the diaphragm back to see that thelungs follow it, keeping in contact with it all the time. Now
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