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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 agama lizard
Explain the DNA structure in details? Structure : Each DNA molecule is a double stranded polymer, consisting of perhaps thousands or millions of linked nucleotides. The two
What is a plant-incorporated protectant? Plant-incorporated protectants are pesticidal substances formed and used by the living plant, typically to protect the plant from pests
LUNG S (PULMONES) - Present in pleural cavity. Covered by double layered pleura. Outer parietal pleura and inner visceral pleura. Both are continuous, slip on
Larval forms - Porifera In the majority of sponges the larval stage develops in the body of the parent. The larva is generally at the blastula stage of development. Figure dis
I usually study in the library on the schools computers so I will be accessing the eBook from many different computers throughout the semester. Is there a limit to how many compute
Mechanical Valves They are made of a combination of metal alloys, pyrolite carbon and dacron. Types of Mechanical Valves Caged-ball Valve (Star-Edwards) A me
Which gas in each of the following pairs would you expect to be more soluble in water? Why? (a) Oxygen and Carbon Dioxide (b) Nitrogen and Ammonia (c) Methane and Hydrogen Sulfide.
definition of dietary factors. or what are dietary factors?
Avian tuberculosis The infection in poultry usually occurs from ingestion of contaminated food and water. The lesions develop in spleen, liver and intestines; less frequently
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