A Textbook in General Zoology
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In our eReader you can find the full English version of the book. Read A Textbook in General Zoology Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book A Textbook in General Zoology
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— The process of digestion is begun in the crop. Here the food is slowly churned and moistened by the juices given out by the glands of the crop. Passing herkick's zool. — 18 274 BIRDS on to the stomach the food is further acted on by the diges- tive juices of this organ. In the gizzard the food is masti- cated, as it were, and more thoroughly mixed with the digestive juices trickling into the gizzard from the stomach.
In the absence of teeth, pebbles are swallowed and retained Brain Caeam Inte...stine Pancfea§ Heart Liver Breastbone Fig. 187. — Internal structure of a bird.
in the gizzard to aid that organ in reducing the food.
In the duodenum the food receives the final digestive ingredients, the bile from the liver and the pancreatic juice.
The circulatory system. — The heart of the sparrow is four chambered and the left side is completely separated from the right side ; therefore there is a double circulation, that is, one set of blood vessels carrying impure (venous) blood and another set carrying pure (arterial) blood.
What to read after A Textbook in General Zoology?
You can find similar books in the "Read Also" column, or choose other free books by Glenn W Glenn Washington Herrick to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
— The process of digestion is begun in the crop. Here the food is slowly churned and moistened by the juices given out by the glands of the crop. Passing herkick's zool. — 18 274 BIRDS on to the stomach the food is further acted on by the diges- tive juices of this organ. In the gizzard the food is masti- cated, as it were, and more thoroughly mixed with the digestive juices trickling into the gizzard from the stomach.
In the absence of teeth, pebbles are swallowed and retained Brain Caeam Inte...stine Pancfea§ Heart Liver Breastbone Fig. 187. — Internal structure of a bird.
in the gizzard to aid that organ in reducing the food.
In the duodenum the food receives the final digestive ingredients, the bile from the liver and the pancreatic juice.
The circulatory system. — The heart of the sparrow is four chambered and the left side is completely separated from the right side ; therefore there is a double circulation, that is, one set of blood vessels carrying impure (venous) blood and another set carrying pure (arterial) blood.
What to read after A Textbook in General Zoology?
You can find similar books in the "Read Also" column, or choose other free books by Glenn W Glenn Washington Herrick to read onlineMoreLess
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