Nature Through Microscope Camera
Nature Through Microscope Camera
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In our eReader you can find the full English version of the book. Read Nature Through Microscope Camera 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 Nature Through Microscope Camera
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The following is an outline that may bring the matter clearly before us, while it ought to make us value the mechanical achievements of our hearts and the magnificence of the structure capable of such heavy work : 1 In estimating the amount of work done by any machine it is usual to express it in terms of " unit of work. ' 7 The "unit of work" is defined to be the energy expended in raising a unit of weight (1 Ib. ) through a unit of height (one foot). In England the "unit of work" is the "foot...-pound. " The work done by the heart at each contraction can be readily found by multiplying the weight of the blood expelled by the ventricles by the height to which the blood rises in a tube tied to an artery. This height has been found to be about 9 feet in the horse, and it has been shown that this estimate is nearly correct for a large artery in man.
c Taking the weight of blood expelled from the left ventricle at each systole as 4 ozs. , that is, J Ib. , we have 9 x J = 2J foot-pounds i6o HUMAN BONE as the work done by the left ventricle at each systole; and adding to this the work done by the right ventricle (about a third that of the left) we have 2J + f = 3 foot-pounds as the work done by the heart at each contraction.
What to read after Nature Through Microscope Camera?
You can find similar books in the "Read Also" column, or choose other free books by Richard Kerr to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The following is an outline that may bring the matter clearly before us, while it ought to make us value the mechanical achievements of our hearts and the magnificence of the structure capable of such heavy work : 1 In estimating the amount of work done by any machine it is usual to express it in terms of " unit of work. ' 7 The "unit of work" is defined to be the energy expended in raising a unit of weight (1 Ib. ) through a unit of height (one foot). In England the "unit of work" is the "foot...-pound. " The work done by the heart at each contraction can be readily found by multiplying the weight of the blood expelled by the ventricles by the height to which the blood rises in a tube tied to an artery. This height has been found to be about 9 feet in the horse, and it has been shown that this estimate is nearly correct for a large artery in man.
c Taking the weight of blood expelled from the left ventricle at each systole as 4 ozs. , that is, J Ib. , we have 9 x J = 2J foot-pounds i6o HUMAN BONE as the work done by the left ventricle at each systole; and adding to this the work done by the right ventricle (about a third that of the left) we have 2J + f = 3 foot-pounds as the work done by the heart at each contraction.
What to read after Nature Through Microscope Camera?
You can find similar books in the "Read Also" column, or choose other free books by Richard Kerr to read onlineMoreLess
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