Human Physiology for the Use of Elementary Schools
Human Physiology for the Use of Elementary Schools
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There are, therefore, two motions required, an upward and an outward ; the first increases the distance between the spine and sternum ; the last, that between the ribs. Now these motions are both effected by the ribs, and they are so articulated, that they cannot perform the one without the other. By looking at the cut, then, it will readily be seen how where the ribs rise, the sternum will be pushed out, and of course the cavity of the chest enlarged.
5. The Muscles. All the muscles which are ...attached to the bones just described, aid more or less in respiration, Ithough the intercostal muscles are those chiefly concerned^ These run from one rib to another, filling up the spaces be- RESPIRATION. 3J-4I tween them. These muscles, though thin, consist of a double layer of fibres, the external and the internal, which pass in inverse directions, one layer from above downwards, the other from behind forwards, from edge to edge of the ribs, crossing each other. Now, the first rib being fixed, the second move- able, but less so than the third, the third less than the fourth, and so on through the whole series ; the contraction of the intercostals must consequently elevate the whole series, as the upper ribs serve as fixed points for the action of the muscles.
What to read after Human Physiology for the Use of Elementary Schools?
You can find similar books in the "Read Also" column, or choose other free books by Charles a Charles Alfred Lee to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
There are, therefore, two motions required, an upward and an outward ; the first increases the distance between the spine and sternum ; the last, that between the ribs. Now these motions are both effected by the ribs, and they are so articulated, that they cannot perform the one without the other. By looking at the cut, then, it will readily be seen how where the ribs rise, the sternum will be pushed out, and of course the cavity of the chest enlarged.
5. The Muscles. All the muscles which are ...attached to the bones just described, aid more or less in respiration, Ithough the intercostal muscles are those chiefly concerned^ These run from one rib to another, filling up the spaces be- RESPIRATION. 3J-4I tween them. These muscles, though thin, consist of a double layer of fibres, the external and the internal, which pass in inverse directions, one layer from above downwards, the other from behind forwards, from edge to edge of the ribs, crossing each other. Now, the first rib being fixed, the second move- able, but less so than the third, the third less than the fourth, and so on through the whole series ; the contraction of the intercostals must consequently elevate the whole series, as the upper ribs serve as fixed points for the action of the muscles.
What to read after Human Physiology for the Use of Elementary Schools?
You can find similar books in the "Read Also" column, or choose other free books by Charles a Charles Alfred Lee to read onlineMoreLess
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