Title: Arthur and Fritz Kahn Collection 1889-1932
Identifier: arthurfritzkahn_04_reel04 (find matches)
Year: [1] (s)
Authors: Kahn, Arthur and Fritz
Subjects: Kahn, Fritz 1888-1968; Kahn, Arthur David 1850-1928; Natural history illustrators; Natural history
Publisher:
Contributing Library: Leo Baeck Institute Archives
Digitizing Sponsor: Leo Baeck Institute Archives

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The Circulation of the Blood Paths and Functions of the blood in the Human Body by Dr.F. Kahn Edited by Professor V. H. Mottram, M. A. The blood is the general means of transport of the body for the supply of its parts with food materials and for the removal from them of the products of their activity. To fulfil its task it travels in a closed circuit, and we therefore speak of this movement as the circulation of the blood. In lower animals, e.g. the insects, the blood moves freely in between the Organs, but in higher creatures it is con- fined within vessels something like india- rubber tubes. That the blood may be driven through the arteries, a centrally lying part of the vascular system has been developed into a self-regulating pump: the Heart. To ensure the blood reaching every part of the body, the blood-vessels brauch like the branches of a tree, and divide into many hundred million tubes of the smallest calibre which traverse even the tiniest group of cells of the body, so that no region is excluded from the supply of blood. The smallest blood-vessels are called C a p i 11 a r i e s, (i. e. hair-like vessels) though thcy are many times smaller than a hair and are visible only under a micro- scope. Their walls are so thin that the blood and its contents can be seen through them with ease. Exchange of substances between the blood and the tissues of the body takes place through this tenuous mem- brane. The blood never leaves the blood- vessels, but after its passage through the capillaries is gathercd together again into larger and larger vessels (veins) and flows back through these to the heart. The vessels which lead from the heart to the capillaries, and in which the blood travels away from the heart, are called A r t e r i e s. They are coloured scarlet in the diagram because the living blood in them is scarlet. Those blood-vessels through which the blood flows back from the capillaries to the heart are called Veins; and because the exhausted blood in them is bluish-red in colour, they are coloured blue in the diagram. In simple and small creatures, such as the Worms, the circulation of the blood is a simple circuit. In larger animals, on the other band, the heart would not have the power to drive the blood at one impulse LUNGSxNSH
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Fig. 1. Ground plan of the circulation of the blood The heart (a, b, c, d)consists on each side of auricle (a and c) and ventricle (b and d). The auricles fill with blood and the ventricles pump it on. The blood travels in the aircction i, 2, 3, 4 1

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