File:Biology and man (1944) (20374643072).jpg

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Title: Biology and man
Identifier: biologyman00grue (find matches)
Year: 1944 (1940s)
Authors: Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965; Bingham, N. Eldred (Nelson Eldred), 1901-
Subjects: Biology; Human beings
Publisher: Boston, New York, (etc. ) Ginn and company
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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Oviduct (Fallopian tube) Kidney Ureter Oviduct (Fallopian tube) Urethra BEhNAPD FRIEDMAN FEMALE REPRODUCTIVE ORGANS IN MAMMALS The egg discharged into the body cavity, enters the Fallopian tube, carried along by movements of cilia on the lining cells. The egg meets the sperms and .s fertilized inside the egg tube. The oviduct ends in the muscular uterus, within which the new individual develops differ from each other as do male and female, for example. Indeed, this condition is quite general. It would be strictly true to say that many species are not merely dimorphic, or existing in two forms, sexually, but have three or even more "forms". t u f We saw that the Sporozoa reproduce by means of spores. In the case ot the malarial parasite, for example, the spores are discharged into the plasma of the host's blood. If now a mosquito draws some of such infected blood, the stage of the parasite inside the mosquito reproduces sexually; the protoplasm divides up into tiny structures which unite in pairs. The sexual and the asexual state alternate so long as the parasite can get into a mosquito, then into a warm-blooded host, into a mosquito again, and so on (see page 622). Is There Alternation of Generations in Plants? The Life History of the Moss In the common species of mosses, the familiar green plants with small leaflets are male and female plants. In addi- tion, there is a generation that reproduces by means of spores. Among the 383

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