Practical Zoology
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In our eReader you can find the full English version of the book. Read Practical 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 Practical Zoology
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84, g, and 85). If we cut off a small piece of the gill of a living mussel, an opera- tion that does not cause pain to the animal, and examine it under a compound microscope, we shall find it covered with minute hairlike projections, the cilia, which are waving back and forth. A little powdered carmine placed in the water near the piece of gill will be driven in one direction by these cilia. Considering the fact that all the gill filaments are covered with cilia, it is 150 PRACTICAL ZOOLOGY eas...y to understand what produces the current of water entering and passing out through the siphons. These cilia always pro- vide a fresh supply of water from which oxygen and food are ob- tained, thus enabling the sluggish mussel to live successfully without moving about for its food and oxygen. In one respect the mussel and crayfish are similar; both create currents of water which allow them to breathe when resting quietly in one place, but the crayfish must go out after its food and is therefore active, whereas the mussel draws the food to itself and may therefore be as lazy as it pleases.
What to read after Practical Zoology?
You can find similar books in the "Read Also" column, or choose other free books by Robert William Hegner to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
84, g, and 85). If we cut off a small piece of the gill of a living mussel, an opera- tion that does not cause pain to the animal, and examine it under a compound microscope, we shall find it covered with minute hairlike projections, the cilia, which are waving back and forth. A little powdered carmine placed in the water near the piece of gill will be driven in one direction by these cilia. Considering the fact that all the gill filaments are covered with cilia, it is 150 PRACTICAL ZOOLOGY eas...y to understand what produces the current of water entering and passing out through the siphons. These cilia always pro- vide a fresh supply of water from which oxygen and food are ob- tained, thus enabling the sluggish mussel to live successfully without moving about for its food and oxygen. In one respect the mussel and crayfish are similar; both create currents of water which allow them to breathe when resting quietly in one place, but the crayfish must go out after its food and is therefore active, whereas the mussel draws the food to itself and may therefore be as lazy as it pleases.
What to read after Practical Zoology?
You can find similar books in the "Read Also" column, or choose other free books by Robert William Hegner to read onlineMoreLess
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