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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 Lactation? High levels of estrogens and progesterone during pregnancy stimulate the breasts to develop prior to lactation, or milk production. At the same time, levels
filter feeding mode of nutrition is observed in- a) amoeba b) euglena c)paramoecium d) all of the above
This constitutes about 2.4% of the body weight of man viz. Brain-1400 gram Spinal nerve-150 gram Spinal cord-30 gram Cranial nerve-10 gram C.S.F. is altogether not present in
How Vitamin K used to Prevents bone loss? Vitamin K is known to inhibit bone loss through inhibiting effect on osteoclast formation. Thus, adequate levels of vitamin K must be
what is xylem fiber?
44+(XXY) is in which syndrome?
In a neuron with a resting potential of -65 mV, the distribution of which ion across the neuronal membrane represents the LEAST potential electromotive force (EMF)? A. Potassium
What are the main intraspecific ecological interactions? The main harmonious intraspecific ecological interactions are colonies and societies. The major inharmonious intraspeci
What are the Stages of soil The development of soil takes place in two stages. In the first stage there is formation of parent material which is generally consolidated and cons
Endosperm - Pollen Biology The examination of live material of j. montana reveals that the division of the primary endosperm nucleus is transverse, followed by the laying down
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