Elementary anatomy, physiology and hygiene for higher grammar grades . is an organ. Its work is tomake a fluid which is sent through a little tube into the 42 PHYSIOLOGY intestine, where it helps to digest the food. The pancreasis a glandular organ. Glandular organs are composed ofmany tubes lying close together. Each tube is surrounded by cells set together like blocksin a pavement. Figure 17shows a very simple pancreas is composed ofmany hundreds of crookedtubes, all lined with cells whichmake the digestive fluid. SYSTEMS OF ORGANS. flfl. 17. — Diagram illustratingthe plan of a gla
Elementary anatomy, physiology and hygiene for higher grammar grades . is an organ. Its work is tomake a fluid which is sent through a little tube into the 42 PHYSIOLOGY intestine, where it helps to digest the food. The pancreasis a glandular organ. Glandular organs are composed ofmany tubes lying close together. Each tube is surrounded by cells set together like blocksin a pavement. Figure 17shows a very simple pancreas is composed ofmany hundreds of crookedtubes, all lined with cells whichmake the digestive fluid. SYSTEMS OF ORGANS. flfl. 17. — Diagram illustratingthe plan of a gland. A, cellswhich line the gland; B, blood-vessels; C, connective tissue.[From Millers Histology.] We have been studying or-gans. We found that the stom-ach is a digestive organ; theintestine is a digestive organ,and the pancreas also. Thereare other organs which assist in digestion : the mouth,with its teeth, tongue, and salivary glands, prepares thefood for swallowing; the esophagus (e-sof a-gus) is thetube which carries the food to the stomach. Thenthe stomach and intestine hold the food while it is beingdigested by the fluids made in the stomach, intestine, andpancreas. All of these organs work together in the prep-aration and digestion of food, and we call them collectivelythe Digestive System. In a similar way there are numerous organs which all worktogether to carry the blood all over the body. All of theseorgans taken together are called the Oiroulatory System. The organs which work together to bring oxygen intothe body and ca
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