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Q. How does the inflammation mechanism work?
When some tissue injury other vasoactive and occurs histamine substances (called mediators of inflammation) are released, they cause the blood flow and vasodilation to the affected site increases. Granulocyte leukocytes present in the blood are attracted to the site of the injury by substances called as chemotactic factors also released by the injured tissue and by the active granulocytes in the area. The granulocytes exit the capillaries by diapedesis that is using pseudopods and Macrophages present in the region are activated too. These cells flood the extracellular space of the affected area trying to eliminate or kill harmful agents, to prevent to isolate and tissue necrosis the damaged tissue.
Is there vaccine against tuberculosis? The vaccine against tuberculosis is known as BCG (bacillus Calmette-Guérin). BCG is not used in some countries where tuberculosis is not
Chloroplasts Like mitochondria, chloroplasts are also distinctive organelles of eucaryotic cell. But they are found only in plant cells. Chloroplasts contain membranes forming
gaseous exchange in man
Q. What is the relation between the hypophysis and the thyroid? The hypophysis secretes TSH (thyroid- stimulating hormone). This hormone hastens the secretion of thyroid hormon
Before we proceed to discuss kin selection we should define the term altruism. It refers to the behaviour pattern of an individual in the population for the benefit of other member
CILIA AND FLAGELLA Purkinj e first observed ciliary movement. Hodge studied detail structure of sperm flagellum. Manton studied structure of cilia in plants.
composition,sources,importance,types,requirements for each food substances
Explain Changes in feeding behaviour of infants? On maturation of neuro-muscular system, the body is able to coordinate sucking, swallowing and breathing. Till about three mont
Giant chromosomes
How do embryos of placental mammals excrete nitrogen wastes? Placental animals, as well as embryos, excrete urea. In the adult placental mammal urea is excreted by the urine.
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