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Define Natural killer cells (NK cells)
They are large sized lymphocytes, specifically equipped to kill virally infected cells, some of the virally infected cells acquire a special glycoprotein on their surface which signals their neighbouring cells that they are in trouble and they need help.
The NK cells are especially receptive to this cry for help because they have surface proteins which are very similar to the ones which have glycoprotein coatings. When the 2 components come together in contact, the NK cells would release lethal substances which lead to the death of infected cell. The infected cell is killed and it has a chance to multiply. The major drawback of this process is that the host cell gets sacrificed.
Explain Role of the Mucous in Body Systems and Organs - The gastrointestinal tract: The microbes which enter through the mouth are caught in the mucous and eliminated with sput
what is light energy
Cosmic Distances: If we asked you what the distance between Delhi and Kanyakumari is, you would say that it is roughly 3000 km. Another way of answering the question would
Explain the Vasomotor Centre and Cardio-Inhibitory Centre The vasomotor centre (in the medulla ablongata) excites the respiratory centre. The pulmonary ventilation is increased
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Lab coats : The lab coat should fit well and should be buttoned up correctly at all times. Cotton lab coats are more suitable than those made from nylon as the former could absorb
Explain what is Argininosuccinate Synthetase In a 2-step reaction catalyzed by the cytosolic enzyme argininosuccinate synthetase, citrulline and aspartate are condensed to form
Define Macrophages - CSF It is produced by macrophages, fibroblasts and endothelial cells. They specifically stimulate precursors of macrophages. It also enhances effector res
The water will not run through the cloth Choose a glass jar and a piece of cloth from an old sheet or handkerchief. Fill the jar with water. Wet the cloth well, stretch it over
Define Hyposecretion of Adrenocortical Hormones Hyposecretion of hormones from the adrenal cortex results in the development of the condition known as Addison's disease. There
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