. A manual of elementary zoology . Zoology. THE PROTOZOA AS PARASITES OP MAN 145 In this the nucleus, after proceedings in which some of its chromatin is lost, while a large vacuole temporarily appears in the cytoplasm, forms eventually two nuclei while a cyst is being secreted around the body. The two nuclei in the cyst divide into eight. The ordinary Entamoeba die in the feces. So also do the cysts unless the feces dry, but in the latter case they are distributed as dust, and if they thus reach water or human food and are swallowed by a man the cysts germinate in the intestine of the new hos
. A manual of elementary zoology . Zoology. THE PROTOZOA AS PARASITES OP MAN 145 In this the nucleus, after proceedings in which some of its chromatin is lost, while a large vacuole temporarily appears in the cytoplasm, forms eventually two nuclei while a cyst is being secreted around the body. The two nuclei in the cyst divide into eight. The ordinary Entamoeba die in the feces. So also do the cysts unless the feces dry, but in the latter case they are distributed as dust, and if they thus reach water or human food and are swallowed by a man the cysts germinate in the intestine of the new host, the protoplasm dividing and emerging as. Fig. 88.—Entamceba.—After Fantham. A, E. coli\ B, E. dysenteries. , Ingested red blood corpuscle ;, food vacuole ; mi., nucleus ; ps., pseudopodium. little individuals each with a nucleus. By these the cycle is re-started. Entamceba dysenteries, sometimes known as E. histolytica, also inhabits the human intestine. It varies much in size but reaches greater dimensions than E. coli, from which it also differs in being more active, having a distinct ecto- plasm over the whole surface of the body, and taking up strongly, while still alive, the stain known as "neutral ; Unlike E. coli it bores through the mucous membrane of the intestine. This it does by making its pseudopodia of a sharper shape. It then penetrates the blood vessels in the same way, and is carried by the circulation to the liver, where it may set up abscesses. Its action on the intestinal wall causes dysentery. It feeds not only on bacteria but also. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Borradaile, L. A. (Lancelot Alexander), 1872-1945. London : H. Frowde, Hodder & Stoughton
Size: 2155px × 1160px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
