https://www.khanacademy.org/science/grade-6-science-snc-aligned/x19bc096754f0b9af:cellular-organisation/x19bc096754f0b9af:animal-cells-and-tissues/v/human-skin-our-skeletal-system-and-the-skin-ur 2025-08-07T23:35:51.501752344Z Human Skin Created by Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Human Skin Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/nKO_bbdNd0E.mp4/nKO_bbdNd0E.mp4 284 Animal cells and tissues https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:coordination-and-control/x2a084a90105205d2:untitled-359/e/human-skin 2026-04-07T23:36:17.218592739Z Human Skin Let's do some questions vibhor exercise https://www.khanacademy.org/science/health-and-medicine/circulatory-system/heart-muscle-contraction/v/three-types-of-muscle 2023-09-10T17:11:17.624018169Z Three types of muscle Our bodies are equipped with three types of muscles: skeletal, cardiac, and smooth. Skeletal muscles, attached to bones and tendons, help us move voluntarily and quickly. Cardiac muscles, found only in the heart, work involuntarily and at a moderate speed to keep our heart beating. Smooth muscles, found in hollow organs and blood vessels, work slowly and involuntarily to control functions like digestion and blood flow. Each muscle type has a unique cellular structure. Rishi Desai video https://cdn.kastatic.org/googleusercontent/qqSkRyaST354-jfXhCgthZeGuHOaF01ho4EvSrXQXnEYLLjwZ0PCkjzg4w1m53dHsSBcwkbspvxJYiYyuN1lOQmG Three types of muscle Our bodies are equipped with three types of muscles: skeletal, cardiac, and smooth. Skeletal muscles, attached to bones and tendons, help us move voluntarily and quickly. Cardiac muscles, found only in the heart, work involuntarily and at a moderate speed to keep our heart beating. Smooth muscles, found in hollow organs and blood vessels, work slowly and involuntarily to control functions like digestion and blood flow. Each muscle type has a unique cellular structure. https://cdn.kastatic.org/ka-youtube-converted/bwOE1MEginA.mp4/bwOE1MEginA.mp4 689 Animal cells and tissues https://www.khanacademy.org/science/biology/human-biology/neuron-nervous-system/v/anatomy-of-a-neuron 2021-03-23T22:19:12Z Anatomy of a neuron Neurons (or nerve cells) are specialized cells that transmit and receive electrical signals in the body. Neurons are composed of three main parts: dendrites, a cell body, and an axon. Signals are received through the dendrites, travel to the cell body, and continue down the axon until they reach the synapse (the communication point between two neurons). Sal Khan video https://cdn.kastatic.org/googleusercontent/Rrix3I9XqqAtLRbxXUKH-dgpg8iVCgVIkwH2WGb-cbt6r1tfcW8YS9T18QAite6Y8CBUsVFF4sGQTwYSu-X7xbVe Anatomy of a neuron Neurons (or nerve cells) are specialized cells that transmit and receive electrical signals in the body. Neurons are composed of three main parts: dendrites, a cell body, and an axon. Signals are received through the dendrites, travel to the cell body, and continue down the axon until they reach the synapse (the communication point between two neurons). https://cdn.kastatic.org/ka-youtube-converted/ob5U8zPbAX4.mp4/ob5U8zPbAX4.mp4 373 Animal cells and tissues https://www.khanacademy.org/science/biology/human-biology/neuron-nervous-system/a/overview-of-neuron-structure-and-function 2023-09-14T11:22:40.102153098Z Overview of neuron structure and function Introduction to neurons and glia. How the structure of a neuron allows it to receive and transmit information. article https://www.khanacademy.org/science/cambridge-o-level-biology-cie/x2a084a90105205d2:coordination-and-control/x2a084a90105205d2:synapses-and-transmission-between-neurons/e/neurons 2026-03-05T08:50:45.400692349Z Neurons This exercise provides practice for basic understanding of a neuron. saiyem exercise https://www.khanacademy.org/science/bridge-course-class-11th-biology/xfa1bbeaa3bc88e64:control-and-coordination/xfa1bbeaa3bc88e64:neuros-reflex-action-and-the-brain/e/neurons-and-reflex-action 2025-03-30T13:01:39.012708499Z Neurons and reflex action Let's solve some questions! vibhor exercise https://www.khanacademy.org/science/bridge-course-class-11th-biology/xfa1bbeaa3bc88e64:cells-and-tissues/xfa1bbeaa3bc88e64:tissues/e/muscular-tissue-and-neural-tissue 2026-04-21T09:50:34.424034119Z Muscular tissue and neural tissue This exercise covers the different types of muscular and neural tissues. Moumita Sen exercise https://www.khanacademy.org/science/biology/human-biology/circulatory-pulmonary/a/components-of-the-blood 2024-03-27T09:57:43.690871742Z Components of blood The different components that make up blood. Plasma, white blood cells, red blood cells, platelets. article