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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.
SKULL- Present in head region. It is supported on the top of vertebral column. It is made up of the hardest and denest bones in the human body. It consists of cranium
Define Advantages of using Yeast as a source of Protein? 1. Large size, hence separation from the culture medium is easy. 2. As the pH of the growth is towards acidic side,
What is Working of Mouth in human body? Food enters the digestive system through the mouth, where it is processed by the teeth and mixed with saliva, prior to being swallowed.
Why can it be said that a recessive allele can remain hidden in the phenotype of an individual and revealed only when manifested in homozygosity in the offspring? A recessive a
Predisposing factors The incidence of metabolic diseases in cows and buffaloes increases as the milk production increases and the herd size becomes larger. The highest inciden
Calculate Temperature for Survival and Growth of Microorganisms? Survival and growth of microorganisms is also affected by the temperature. According to their temperature requi
Culture Medium - Techniques of Plant Tissue Culture In nature green plants are capable of synthesizing organic compounds necessary for their growth and development from the mi
One can verify the age of an oak tree by counting the annual rings of formed by the. a. primary xylem, apical meristem b. secondary phloem, vascular cambium c. dermal
How to antioxidants work in Cancer Prevention? As cells function normally in the body, they produce damaged molecules called free radicals. These force radicals, we learnt are
The Svalbard ptarmigan (Lagopus mutus hyperboreus) is a small herbivorous bird that lives permanently on the island chain of Svalbard. Svalbard is located in the Arctic Circle, app
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