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Q. Is the epithelium vascularized? How do oxygen and nutrients reach the epithelium? Why is this feature an important evolutionary acquisition?
Epithelia are not vascularized capillaries don't directly reach their cells the epithelium exchanges substances by diffusion with the connective tissue situated under it.
Since the epithelia are not vascularized minuscule scratches or skin injuries that happen all the time do not trigger bleeding and do not expose the blood to contamination from external agents this is an important protective strategy discovered by evolution.
Define lipids 'lipids' defines substances as oils, fats and waxes which can be only characterized by a large array of properties. They are in general: - coming from plant
Q. What and how many are the pulmonary veins? The pulmonary veins are part of the pulmonary circulation they are vessels that carry oxygen-rich (arterial) blood from the lungs
write about complementary genes
The main points which is based on the seminar topic Bio geographical evidences
State the term Cercaria? A stage in the life cycle of trematode flukes. Cercaria develops from redia found in intermediate host. This tadpolelike organism is released from inte
Q. What is meant by "mutualist exploration of cellulose digestion", a phenomenon that occurs in some mammals and insects? Herbivorous animals eat great amounts of cellulose a s
Q. What are the fundamental constituents of the cell membrane? The cell membrane is formed of lipids, carbohydrates and proteins. The membrane lipids are phospholipids, a sp
Explain Spread Plate Method - Pure Culture Techniques? In this method, diluted microbial suspension containing about 30 to 300 colonies is spread uniformly on the agar surface
How do carrier proteins transport substances across cell membranes? Carrier proteins bind to a molecule of the substance on single side of the membrane, change shape, transpor
Osmoregulation in Non-Chordate Metazoans Previously you have studied that in protozoans, particularly fresh water protozoans; contractile vacuoles play a significant role in t
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