https://www.khanacademy.org/science/biology/human-biology/immunology/v/types-of-immune-responses-innate-and-adaptive-humoral-vs-cell-mediated 2023-12-04T19:02:25.924542584Z Types of immune responses: Innate and adaptive, humoral vs. cell-mediated The immune system is divided into nonspecific (innate) and specific (adaptive) responses. Nonspecific defenses, like skin and stomach acid, block pathogens indiscriminately. Specific defenses, such as B and T lymphocytes, adapt to specific pathogens after exposure. B lymphocytes are part of the humoral response, dealing with pathogens in body fluids. Sal Khan video https://cdn.kastatic.org/googleusercontent/j95EjRIg4fkrVfKTFJyQzfAqg_5x15-AIUIZWSx0VK25PzRl-_AAfG8rBUbl-tJeglOliaMbM3TSx2NUioUM5Q Types of immune responses: Innate and adaptive, humoral vs. cell-mediated The immune system is divided into nonspecific (innate) and specific (adaptive) responses. Nonspecific defenses, like skin and stomach acid, block pathogens indiscriminately. Specific defenses, such as B and T lymphocytes, adapt to specific pathogens after exposure. B lymphocytes are part of the humoral response, dealing with pathogens in body fluids. https://cdn.kastatic.org/ka-youtube-converted/rp7T4IItbtM.mp4/rp7T4IItbtM.mp4 487 Third line of defense: specific (adaptive) immunity https://www.khanacademy.org/science/shs-biology-2/x2ea931c66bba6acd:unit-1-name/x2ea931c66bba6acd:immune-system/e/hs-the-immune-system 2021-04-29T08:02:38Z The immune system Test your knowledge on the human immune system! Ashley exercise https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/introduction-to-immunology/v/clonal-selection 2022-11-16T04:22:43.7414897Z Clonal selection Clonal selection is a process by which the body produces B and T cells to respond to infections. These cells each have unique receptors that allow them to identify specific pathogens. When the body encounters an infection, the B and T cells that can recognize the invader multiply rapidly to create an army of cells to fight it. Patrick van Nieuwenhuizen video https://cdn.kastatic.org/googleusercontent/wERofDpnkMQ9I8OzCnNDOIXh2nvul4KZilAcaVCiJoaqL2JxSDJxl37Z81oXpQGmGGu9z93BMnxyosFznHGNi5nsaw Clonal selection Clonal selection is a process by which the body produces B and T cells to respond to infections. These cells each have unique receptors that allow them to identify specific pathogens. When the body encounters an infection, the B and T cells that can recognize the invader multiply rapidly to create an army of cells to fight it. https://cdn.kastatic.org/ka-youtube-converted/EsQyCHs4IBY.mp4/EsQyCHs4IBY.mp4 589 Third line of defense: specific (adaptive) immunity https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/introduction-to-immunology/v/how-white-blood-cells-move-around 2023-08-17T23:33:36.770424498Z How white blood cells move around This video describes the protective function of white blood cells, with a focus on how and where they act. Explore how different white blood cells, including neutrophils and  B and T cells circulate, respond to infections, and communicate via chemical signals. Uncover the role of macrophages in alerting the body to bacterial invaders and the journey of immune cells through blood and lymphatic vessels, and learn about the process of antigen presentation and the production of antibodies. Patrick van Nieuwenhuizen video https://cdn.kastatic.org/googleusercontent/DJ2qM9LZ8aE9RRVf7oswi91j1jSnaIqqyOchjmr2nx33gGQUoLCbpG3kCSj4dPAhZriOsch20EOWGv1hAHj0tTXDrQ How white blood cells move around This video describes the protective function of white blood cells, with a focus on how and where they act. Explore how different white blood cells, including neutrophils and  B and T cells circulate, respond to infections, and communicate via chemical signals. Uncover the role of macrophages in alerting the body to bacterial invaders and the journey of immune cells through blood and lymphatic vessels, and learn about the process of antigen presentation and the production of antibodies. https://cdn.kastatic.org/ka-youtube-converted/LXFQG4Ugreo.mp4/LXFQG4Ugreo.mp4 528 Third line of defense: specific (adaptive) immunity https://www.khanacademy.org/science/ka-biology-grade-12/x406cf103e0507862:in-in-human-health-and-disease/x406cf103e0507862:in-in-types-of-immunity-and-the-immune-system/v/active-passive-immunity 2022-05-20T14:05:59.408880346Z Active & Passive immunity Let's explore what active immunity and passive immunity are. Khadijatul Qubra video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Active & Passive immunity Let's explore what active immunity and passive immunity are. https://cdn.kastatic.org/ka-youtube-converted/2EKIqr4T8Ng.mp4/2EKIqr4T8Ng.mp4 921 Third line of defense: specific (adaptive) immunity https://www.khanacademy.org/science/grade-12-biology-snc-aligned/xa8ba3a087f1f5288:disease-and-immunity/xa8ba3a087f1f5288:third-line-of-defense-specific-adaptive-immunity/e/acquired-immunity-up 2026-04-08T00:54:09.631945657Z Acquired immunity Acquired immunity Moumita Sen exercise https://www.khanacademy.org/science/biology/human-biology/immunology/v/helper-t-cells 2023-08-17T23:33:36.770424498Z Helper T cells Explore the adaptive immune system's key players: B cells, T cells, and helper T cells. Learn how B cells generate antibodies to disable pathogens, while helper T cells raise the alarm. Discover the double-check system that prevents autoimmune diseases and the role of cytotoxic T cells in attacking infiltrated cells. Sal Khan video https://cdn.kastatic.org/googleusercontent/NLJYZ4DcQR566nQx4aVsqsl3mHAnx_NEHcyxSzLytPoLmeS59ZZYG1FVOwcpY2OOCruuPoUzmc3bqIilZJjEB5Pf Helper T cells Explore the adaptive immune system's key players: B cells, T cells, and helper T cells. Learn how B cells generate antibodies to disable pathogens, while helper T cells raise the alarm. Discover the double-check system that prevents autoimmune diseases and the role of cytotoxic T cells in attacking infiltrated cells. https://cdn.kastatic.org/ka-youtube-converted/uwMYpTYsNZM.mp4/uwMYpTYsNZM.mp4 1233 Third line of defense: specific (adaptive) immunity https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology/introduction-to-immunology/v/cytotoxic-t-cells 2023-08-17T23:33:36.770424498Z Cytotoxic T cells This video explores the immune system's response to threats, focusing on the role of antigen presenting cells and cytotoxic T cells. It explains how cytotoxic T cells get activated by MHC-I/antigen complexes and then proceed to identify and destroy pathogens or malfunctioning cells, providing a crucial line of defense in our bodies. Sal Khan video https://cdn.kastatic.org/googleusercontent/nXpCZ3Ca6s8Tu4x1w0P00lJGvAPWSDudIUay2JtGA8V5jQOJ5R-ZZoDxsiueUMMY7_By62mgQMRrZR3if3Gh3Tju Cytotoxic T cells This video explores the immune system's response to threats, focusing on the role of antigen presenting cells and cytotoxic T cells. It explains how cytotoxic T cells get activated by MHC-I/antigen complexes and then proceed to identify and destroy pathogens or malfunctioning cells, providing a crucial line of defense in our bodies. https://cdn.kastatic.org/ka-youtube-converted/oqI4skjr6lQ.mp4/oqI4skjr6lQ.mp4 606 Third line of defense: specific (adaptive) immunity https://www.khanacademy.org/science/biology/human-biology/immunology/v/b-lymphocytes-b-cells 2023-08-17T23:33:36.770424498Z B lymphocytes (B cells) Learn about the role of B cells (B lymphocytes) in the humoral immune response. See how they are activated and produce antibodies that can recognize and bind to pathogens, leading to their destruction. The video also highlights the process of clonal selection and the importance of memory cells in immunity. Sal Khan video https://cdn.kastatic.org/googleusercontent/4uAr53XKz11ZXiHbaoTmaavAy57iqOOlTLYykIAdDsG46YHx5JFUvsDnqNrU7_JAelgE-ovNIKT4eQvExu4bfKY B lymphocytes (B cells) Learn about the role of B cells (B lymphocytes) in the humoral immune response. See how they are activated and produce antibodies that can recognize and bind to pathogens, leading to their destruction. The video also highlights the process of clonal selection and the importance of memory cells in immunity. https://cdn.kastatic.org/ka-youtube-converted/Z36dUduOk1Y.mp4/Z36dUduOk1Y.mp4 853 Third line of defense: specific (adaptive) immunity https://www.khanacademy.org/science/grade-10-biology-snc-aligned/x8178f14e6776dea5:diseases-and-immunity/x8178f14e6776dea5:infectious-and-non-infectious-diseases/e/immune-system-questions 2024-11-20T18:53:26.878481084Z Immune system questions Immune system questions Bradley Kolb exercise https://www.khanacademy.org/science/ka-biology-grade-12/x406cf103e0507862:in-in-human-health-and-disease/x406cf103e0507862:in-in-types-of-immunity-and-the-immune-system/a/adaptive-immunity 2021-04-29T08:00:16Z Adaptive immunity article