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What are the antigen-presenting cells of the immune system?
The antigen-presenting cells of the immune system, also called as APC cells, are cells that do phagocytosis and digestion of foreign (to the body) microorganisms and later expose antigens derived from these microorganisms in the outer side of their plasma membrane. These processed antigens are then recognized by lymphocytes that activate the immune response. Various types of cells, as the macrophages, can act as antigen-presenting cells.
The Immune System - Image Diversity: antigen-presenting cells
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In a neuron at rest, the membrane A. voltage will be less than zero. B. sodium conductance is greater than the membrane potassium conductance. C. voltage is less than the
Lengthening of long bones in humans takes place in a specific area of the bone. This area is known as the: a) Cancellous bone b) Medullary canal c) Periosteum (pron: per-
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a) How do viruses enter plant body and spread to long distances within it? b) Mention any two ways by which viruses spread from single plant to another.
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