Innate vs. adaptive immunity. Humoral adaptive immunity vs. cell-mediated adaptive immunity. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-immune-system/rn-the-… Missed the previous lesson?
Role of phagocytes in innate or nonspecific immunity. Neutrophils, macrophages, and dendritic cells. MHC II. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-immune-system/rn-the-… Missed the previous lesson?
Understanding the structure of a muscle cell More free lessons at: http://www.khanacademy.org/video?v=uY2ZOsCnXIA
The role of the sarcoplasmic reticulum in controlling calcium ion concentrations within the muscle cell. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/rn-muscular-system/rn-th… Missed the previous lesson?
How calcium ion concentration dictates whether a muscle contracts or not. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/nclex-rn-circulatory-sys… Missed the previous lesson?
How myosin and actin interact to produce mechanical force. . Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/test-prep/nclex-rn/nclex-rn-circulatory-sys… Missed the previous lesson?
How one neuron can stimulate (or inhibit) another neuron at a chemical synapse. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/health-and-medicine/human-anatomy-a… Missed the previous lesson?
Correction to "Sodium-potassium pump" video. Created by Sal Khan. Watch the next lesson: https://www.khanacademy.org/science/health-and-medicine/human-anatomy-a… Missed the previous lesson?
