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 



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