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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.
Q. What are peristaltic movements? What is their role in human digestion? Peristalsis is the process of synchronized contractions of the muscular wall of the digestive tube, Pe
PHYLUM NEMATODA (= NEMATHELMINTHES ) Definition and Introduction Bilateral and protostomial
Which of the recombination process(transformation, conjugation and transduction) would be most likely to occur in the natural environment?
Explain nutritional properties of the eggs Drying of eggs under normal conditions causes little loss of the nutritional properties of the eggs. Vitamin A, vitamin B, thiamine,
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Which of the following serves as an effector, or part of an effector, that functions in a negative feedback system? A. 1,25-dihydroxyvitamin D Receptors located intracellularly
examples of pisces
Explain the Potential Benefits of micro nutrients? The potential benefits of micro nutrients should also be taken into account when the nutrient allowances are defined for olde
Explain Vitamin K as an essential fat soluble micronutrient? Vitamin K is an essential fat-soluble micronutrient the only unequivocal role in health is in the maintenance of no
Q. What is the deplasmolysis of plant cells? The plant cell when placed under hypertonic medium loses a great quantity of water and its cell membrane detaches from the cell wal
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