https://www.khanacademy.org/science/biology/human-biology/immunology/v/role-of-phagocytes-in-innate-or-nonspecific-immunity 2023-12-04T19:02:25.924542584Z Role of phagocytes in innate or nonspecific immunity The immune system's primary role is to protect the body from harmful pathogens. It employs two lines of defense for non-specific immunity: the first line, which includes skin and mucus membranes, aims to keep pathogens out. The second line, featuring phagocytes, targets pathogens that have entered the body. This non-specific or innate immune system does not distinguish between types of pathogens, but effectively eliminates them. Sal Khan video https://cdn.kastatic.org/googleusercontent/0mEstcMGG1U_whhSn4u68IUuVIuxoXKIY2lTP7-C1q4yfue58eDyfoRr7KU27i2mFYxJ4MwHvWOsOoqK8tHGttc Role of phagocytes in innate or nonspecific immunity The immune system's primary role is to protect the body from harmful pathogens. It employs two lines of defense for non-specific immunity: the first line, which includes skin and mucus membranes, aims to keep pathogens out. The second line, featuring phagocytes, targets pathogens that have entered the body. This non-specific or innate immune system does not distinguish between types of pathogens, but effectively eliminates them. https://cdn.kastatic.org/ka-youtube-converted/O1N2rENXq_Y.mp4/O1N2rENXq_Y.mp4 980 Second line of defense: innate (nonspecific) immunity https://www.khanacademy.org/science/grade-12-biology-snc-aligned/xa8ba3a087f1f5288:disease-and-immunity/xa8ba3a087f1f5288:second-line-of-defense-innate-nonspecific-immunity/e/immune-system---passage-2 2023-08-04T15:14:14.107569696Z Mini MCAT passage: Neutrophil proliferation and disease Immune System - Passage 2 Raja Narayan exercise https://www.khanacademy.org/science/grade-12-biology-snc-aligned/xa8ba3a087f1f5288:disease-and-immunity/xa8ba3a087f1f5288:second-line-of-defense-innate-nonspecific-immunity/a/phagocytosis 2021-05-25T21:59:57Z Phagocytosis article https://www.khanacademy.org/science/biology/human-biology/immunology/v/professional-antigen-presenting-cells-apc-and-mhc-ii-complexes 2021-03-18T10:33:24Z Professional antigen presenting cells (APC) and MHC II complexes Professional antigen presenting cells (APCs) are immune cells that specialize in presenting an antigen to a T-cell. The main types of professional APCs are dendritic cells (DC), macrophages, and B cells. A professional APC takes up an antigen, processes it, and returns part of it to its surface, along with a class II major histocompatibility complex (MHC). The T-cell is activated when it interacts with the formed complex. Sal Khan video https://cdn.kastatic.org/googleusercontent/vF5-nQxnwoZU5LH0Han2xLjYFEX5lB_eaUkwe1wYiNkWkqn6yr-o-WCNiUn0dic8rQNA5HJKvH6FxZ2pvrDquqO4PA Professional antigen presenting cells (APC) and MHC II complexes Professional antigen presenting cells (APCs) are immune cells that specialize in presenting an antigen to a T-cell. The main types of professional APCs are dendritic cells (DC), macrophages, and B cells. A professional APC takes up an antigen, processes it, and returns part of it to its surface, along with a class II major histocompatibility complex (MHC). The T-cell is activated when it interacts with the formed complex. https://cdn.kastatic.org/ka-youtube-converted/j_kSmmEpvQk.mp4/j_kSmmEpvQk.mp4 693 Second line of defense: innate (nonspecific) immunity https://www.khanacademy.org/science/grade-7-science-snc-aligned/x64f379bc07a3640a:immunity-and-diseases/x64f379bc07a3640a:non-specific-defence/a/innate-immunity 2021-05-25T21:59:58Z Innate immunity article https://www.khanacademy.org/science/biology/human-biology/immunology/v/inflammatory-response 2021-03-18T10:33:24Z Inflammatory response Overview of the inflammatory response. Sal Khan video https://cdn.kastatic.org/googleusercontent/CxxeN27svfwBsy7Q6fFMoIEE7YngCtY9jzRD1_-EssPJRYSUJTMRPws7tzs7VhE5WyCedZY-1rPK4KHWDSfRYCXP Inflammatory response Overview of the inflammatory response. https://cdn.kastatic.org/ka-youtube-converted/FXSuEIMrPQk.mp4/FXSuEIMrPQk.mp4 875 Second line of defense: innate (nonspecific) immunity https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:human-body-systems/a/hs-the-immune-system-review 2024-09-19T19:08:55.413551339Z The immune system review Learn about the cells and functions of the immune system. article