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Stages of Immune Response

The immune system's response to exogenous antigens is often subclinical. By endocytosis or phagocytosis, exogenous antigens are taken into the antigen-presenting cells (APCs) and processed into fragments. APCs then present the fragments to T helper cells (CD4+) by the use of class II histocompatibility molecules on their surface. Some T cells are specific for the peptide:MHC complex. They become activated and start to secrete cytokines. Cytokines are substances that can activate cytotoxic T lymphocytes (CTL), antibody-secreting B cells, macrophages, and other particles.

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Channels: Cell Biology

Tags: Immune Response

Uploaded by: ( Send Message ) on 23-11-2010. Dnatube suggest users to have interest in drug testing, mesothelioma, insurance, medical lawyers.

Duration: 2m 14s

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