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Q. Is the epithelium vascularized? How do oxygen and nutrients reach the epithelium? Why is this feature an important evolutionary acquisition?
Epithelia are not vascularized capillaries don't directly reach their cells the epithelium exchanges substances by diffusion with the connective tissue situated under it.
Since the epithelia are not vascularized minuscule scratches or skin injuries that happen all the time do not trigger bleeding and do not expose the blood to contamination from external agents this is an important protective strategy discovered by evolution.
Q. How is hemophilia treated? Why is hemophilia rare in females? Hemophilia is medically treated with administration of factor VIII in case of hemophilia A or of factor IX in c
Xerarch - Kinds of Succession When the succession takes place in drier area, i.e., the succession progresses from xeric to mesic conditions. It is further subdivided as:
General characters of aschelminthes
Explain about the Observation and Classification of Arthropoda? Introduction In the previous unit you have examined the representatives of artliropoda. In this unit, you wi
What is critical photoperiod? And How can the critical photoperiod relate to flowering be experimentally determined? Critical photoperiod is the limit of the photoperiod durati
how many types of respiration are?define them also
How do the cDNAs vary from the original genes? A. The inserted cDNA copies lack enhancers, promoters and introns. B. The genomic structures of the original gene and the ins
T hese are some important uses of biodiversity. 1. Source of food, medicines and drugs: (a) Wheat, rice and maize are three carbohydrate rich crops and contribute
What are the Cardiac muscles We know that the heart muscles (cardiac muscles) are not under the control of mind. The day we are born, it starts its activity and the day peopl
1. Explain how bats determine the distance (range) of their target using echolocation. Be sure to describe the properties of their call that make it possible (use a sketch), and ho
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