Articoli correlati a Object lessons in elementary science; following the...
Object lessons in elementary science; following the scheme issued by the London School Board Volume 3 - Brossura
Sinossi
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 edition. Excerpt: ... just below the stomach, and then turns downwards again, finally opening externally at the lower end of the trunk. Show on a good diagram the position of the liver just near the junction of the small intestines with the stomach. Tell that this great organ has important work to do in connection with digestion. It produces a greenish-yellow, slimy-looking fluid--the bile, and pours it into this part of the small intestines, by a little tube which opens into them. This bile has the power of dissolving fatty, oily matters. The same opening which admits the bile into the intestine also admits another little tube from an organ called the pancreas. This tube brings a fluid known as the pancreatic juice, which resembles both the saliva and the gastric fluid. Now let us see what all this has to do with the work of digestion. The whole of the food is not dissolved in the stomach. All that remains in an undigested state passes out into the small intestine. There it receives bile from the liver to dissolve the "fats," and pancreatic juice from the pancreas to complete the work of digesting or dissolving. The walls of the intestines are strong and muscular, and as they contract they force the stream of food onward--the fluids digesting it as it goes. Lesson XXXIII ABSORPTION I. Introduction Commence by making the class describe again the passage of fluids through a membrane by osmosis. Tell that all fluids have not this osmotic force to the same extent. Some pass more easily through a membrane than others. and some will not penetrate at all. For example, osmosis will not take place with starch, but sugar solution passes readily through a membrane. Put some white of egg or some oil into a bladder, and immerse the bladder in a vessel of water. No exchange takes...
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