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Is the epithelium vascularized? How do nutrients and oxygen reach the epithelium? Why is this feature a significant evolutionary acquisition?
Epithelia are not vascularized (capillaries do not directly reach their cells). The epithelium exchanges substances by dispersal with the connective tissue situated under it.
As the epithelia are not vascularized minuscule skin injuries or scratches that occur all the time do not trigger bleeding and do not expose the blood to contamination from external agents. This is an significant protective method discovered by evolution.
what is the excretory organ of lizard
Q. Why are vaccines used in the prevention but not in the treatment of infections? Why can antivenom serums be used in prevention and treatment? Vaccines are not used in the tr
Q. Can two normal individuals of the same species with sexual reproduction have identical karyotypes and identical genomes? And how is the human karyotype usually represented?
What are biotic factors? Biotic factors are living beings (plants, microorganisms and animals) that are part of a given environment.
Which of the following is true for a toe corticospinal interneuron that produces action potentials during movements of the big toe of the left foot? A. A portion of its axon is
Will there be an opportunity to comment? In a supplemental notice accompanying the last rule package, EPA is soliciting additional information and public comment on issues fro
Immunotoxin is formed by conjugating or combining an antibody with highly toxic agent.
Meteorological Factors and Air Pollution Air pollution levels in a region are affected by wind, location, topography, precipitation and temperature inversions. Wind can carry
Why is a leguminous crop rotation used in agriculture? Leguminous crop rotation and other crop rotations are used in agriculture because in these plants many bacteria significa
Complete feed blocks For manufacturing the pellets, processes such as grinding, mixing, steaming and pressing and some times extruding, are applied using special and expensive
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