. Biology; the story of living things. THE METABOLIC MACHINERY OF ANIMALS ;n7 Respiratory System in Man Air passes from tjie nostrils through the shthke glottis into the windpipe. This tube, called the trachea, the top of which may easily be felt as the " Adam's apple " of the throat, is supported by a series of cartilaginous rings complete in front but incomplete behind and divid- ing into two hronchi. Within the lungs, the bronchi break up into a great number of smaller tubes, the hronckiolcs, which divide somewhat like the small branches of a tree and arc lined with ciliated epith
. Biology; the story of living things. THE METABOLIC MACHINERY OF ANIMALS ;n7 Respiratory System in Man Air passes from tjie nostrils through the shthke glottis into the windpipe. This tube, called the trachea, the top of which may easily be felt as the " Adam's apple " of the throat, is supported by a series of cartilaginous rings complete in front but incomplete behind and divid- ing into two hronchi. Within the lungs, the bronchi break up into a great number of smaller tubes, the hronckiolcs, which divide somewhat like the small branches of a tree and arc lined with ciliated epithelial cells. The re- mainder of the tubes are also lined with ciliated cells, the cilia of which are con- stantly in motion lashing with a quick stroke toward the outer end of the tube, that is, toward the mouth. Hence any foreign material in the tubes will be ex- pelled first by the action of the cilia and then by pharynjc xtvulcc. -epiglottis esophagits .bronchial tubes orbr^chioles coughing or "clearing the. The respiratory system of man. Note the cartilagenoiis rinjjs supporting the ducts. ; The bronchial tubes end, as already noted, in very minute air sacs called al- veoli. Great numbers of these are present, thereby increasing the respiratory surface tremendously. These tiny pouches have elastic walls into which air is taken when we inspire or take a deep breath. Around the walls of the pouches and separated by a xcry thin membrane, are numerous capillaries from the pulmonary artery which brings the blood from the right ventricle of the heart to the lungs. Through the very thin walls of the air sacs a diffusion of gases takes place, which results in the blood giving up carbon dioxide and taking in oxygen. Consequently the blood becomes a brighter red, due to formation of oxyhemoglobin by the combination of oxygen with the hemoglobin in the red Please note that these images are extracted from scanned page images that may have been digitally en
Size: 1359px × 1839px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorwalterherberteugeneb1867, bookcentury1900, bookpublish
