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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.
Heart of cockroach: In cockroach, heart is situated in pericardial sinus. It has13 chambers These are one behind the other. Each chamber opens into preceeding one. The
What are the Consequences of PEM? The consequences of PEM are most often long lasting and irreversible. The common consequences include: • Irreversible growth retardation
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Why is a leguminous crop rotation used in agriculture? Leguminous crop rotation and other crop rotations are used in agriculture because in these plants many bacteria significa
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Q. Evaluate the texture of various foods? A number of instruments are available to evaluate the texture of various foods. Brief discussions on these instruments follow. Cons
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Ask question end product of aerobic repiration are
Q. How is the body of gastropods divided? The body of gastropods is divided into three major portions: head, foot and the visceral mass. Q. What is the type of digestive sy
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