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Define the Lymphocytes
They are agranulocytes. The nucleus occupies approximately the entire cell. They vary in size from 6- 18 mm diameter; sometimes divide in small and large lymphocytes. Lymphocytes build up 30% to 40% of all leukocytes. Lymphocytes come in two categorizes: B cells (those that mature in bone marrow) and T-cells (those that mature in the thymus). Let us get to know them. B-cells, while stimulated, mature into plasma cells.
These are the cells which generate antibodies. A specific B cell is tuned to a particular germ, and when the germ is availabe in the body, the B-cell clones itself and generates millions of antibodies designed to eliminate the germ. T-cells, on the other hand, in fact bump up against cells and kill them. T-cells termed as Killer T-cells can detect cells in our body which are harboring viruses, and when it detects such type of a cell, it kills it. Two other types of T-cells, termed as Helper and Suppressor T-cells help sensitize killer T-cells and control the immune Response.
Explain Mouth To Mouth Respiration If no instrument is available, one's own lung may be used as a positive pressure pump. Air may be blown into the lungs of the subject by way
PRECAUTIONS FOR FIRE PREVENTION : In the event of fire or explosion occurring there should be a prearranged plan of the necessary action to be taken. All personnel must be made aw
Explain the term - Ants Ants are the most widespread species of insects in soil and consume plant residues, but are more active in humifying insects than plants.
Types of Diseases As we have indicated above. there are diseases,that a person is born with, for example, a baby may have a defective heart at the time of its birth. Then t
Minerals: Our bones and teeth contain large amounts of calcium. An adult has a total of about 1 kg of calcium and a baby has about 30g in their bones. So, during the period o
discuss determinants of food security
How do minerals become rocks and rocks become soil? Ans) Minerals become rocks by pressure and temperature, often deep inside the earth's core, or easily through pressure for i
Why is there more exchangeable calcium than potassium on clay/humus colloid? Calcium is usually abundant except in acid soils which occur in humid area due to excessive leaching.
information about the eyes
The Fume Cupboard : If a reaction uses or produces harmful gases, dusts or vapours, it poses a risk of inhalation. Such reactions should be carried out not on an open bench but in
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