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What are the valves of the venous system? What is their function?
The valves of the venous system are structures within the veins that permit blood to flow only in the normal way (from the tissues to the heart) and forbid it to return in the reverse way in favor of gravity. The valves close when the pressure of the fluid column above (after, regarding usual flux) is higher than the fluid pressure before them. Valves are therefore fundamental for the returning of blood to the heart.
Define Physical activity as a factor for obesity? Sedentary life style with lack of an exercise schedule tends to make one obese. As we approach middle age, our physical activi
How is the genetic determination of sex established in humans? In the diploid genome of human beings there are 46 chromosomes, 44 of them are autosomes and two are sex chromoso
What is Phylum Annelida - Segmented Worms? Members of this Phylum are commonly known as the segmented worms. The body of a segmented worm is made of many individual ring-like s
What a test tube brush and how is it used? It is a method, made with nylon bristles attached to a twisted-wire shaft, used to knock the bottoms out of test tubes.
Q. Which is the cell organelle that is specializing in aerobic respiration? The mitochondria are cell organelles that are specialized in aerobic respiration. Q. Of which ma
what are the names of karyotypes?
related words for reproductive isolation.
Contagious bovine pleuropneumonia (CBPP) This is a highly fatal disease of cattle and of major economic importance in certain tropical countries. It also affects buffaloes, bi
The cell cycle undergoes a sequence of changes which involve a period of growth replication of DNA, Followed by cell division. This sequence of changes is called cell cycle.
Determine the purpose of the study: There must be a sound rationale or justification for every research project. If the pui-pose of the study is clearly presented and just
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