https://www.khanacademy.org/science/health-and-medicine/advanced-muscular-system/x6e556f83:muscle-innervation/v/muscle-innervation 2020-07-15T21:03:13Z Muscle innervation Which muscles do we voluntarily control? Which muscles do we have NO control over? What's the difference between sympathetic and parasympathetic innervation? Learn about how our brain splits its control over the body into autonomic and somatic nervous systems.  By Raja Narayan. Raja Narayan video https://cdn.kastatic.org/googleusercontent/XzdzvcbVohft8bsp30sFJ0cn48htWQxjK_Zw9tvBcH4XAK4yEfNbQ79-HPVfKJwUD6b5OOJjQQ9VqK_yMGgeQP4 Muscle innervation Which muscles do we voluntarily control? Which muscles do we have NO control over? What's the difference between sympathetic and parasympathetic innervation? Learn about how our brain splits its control over the body into autonomic and somatic nervous systems.  By Raja Narayan. https://cdn.kastatic.org/ka-youtube-converted/NqasGo5q5yQ.mp4/NqasGo5q5yQ.mp4 314 How organ systems work together https://www.khanacademy.org/science/health-and-medicine/respiratory-system/breathing-control-ir/v/the-respiratory-center 2021-04-16T14:39:25Z The respiratory center Find out how the respiratory center collects information from all over the body and then helps regulate your breathing. Rishi is a pediatric infectious disease physician and works at Khan Academy. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. Rishi Desai video https://cdn.kastatic.org/googleusercontent/09NlPCOsD21OI38d5SsnuWHTIhiPyNFMV7xjIuvAVfCAA8s56qkfDGGptgyB2tCficD0V3daYItE0KhEoS1rKA The respiratory center Find out how the respiratory center collects information from all over the body and then helps regulate your breathing. Rishi is a pediatric infectious disease physician and works at Khan Academy. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. https://cdn.kastatic.org/ka-youtube-converted/_BFDgTci0ck.mp4/_BFDgTci0ck.mp4 563 How organ systems work together https://www.khanacademy.org/science/health-and-medicine/gastro-intestinal-system/gastrointestinal-intro/v/control-of-the-gi-tract 2023-08-17T23:33:36.770424498Z Control of the GI tract Discover the smart workings of the digestive system, including the enteric nervous system's role in the gastrocolic reflex. Learn about key hormones like gastrin, secretin, and cholecystokinin that regulate digestion, from stomach acid secretion to bile release. Explore how these hormones and neuronal control ensure efficient food processing. Raja Narayan video https://cdn.kastatic.org/googleusercontent/9nAENcoQxZuJ7-SjILTrBg3Jix9eBT4hRowpL-hmemMb7RZEEAsuHKTd7vLlwlqA7AUQ2cpPD9LK9DnMwRRVcp4 Control of the GI tract Discover the smart workings of the digestive system, including the enteric nervous system's role in the gastrocolic reflex. Learn about key hormones like gastrin, secretin, and cholecystokinin that regulate digestion, from stomach acid secretion to bile release. Explore how these hormones and neuronal control ensure efficient food processing. https://cdn.kastatic.org/ka-youtube-converted/_kfB2qKjdgM.mp4/_kfB2qKjdgM.mp4 596 How organ systems work together https://www.khanacademy.org/science/health-and-medicine/respiratory-system/gas-exchange-jv/v/oxygen-movement-from-alveoli-to-capillaries 2020-07-15T21:03:18Z Oxygen movement from alveoli to capillaries Watch as a molecule of oxygen makes its way from the alveoli (gas layer) through various liquid layers in order to end up in the blood. Rishi is a pediatric infectious disease physician and works at Khan Academy. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. Rishi Desai video https://cdn.kastatic.org/googleusercontent/JYgZsC4G9QfpXt_TsIoFLuvK2b6ynrClVFcggMi326ms7Wx6ogiKmOP5Gc0R7xRArwD8fmiI_MzkGqanNAF7gD_T Oxygen movement from alveoli to capillaries Watch as a molecule of oxygen makes its way from the alveoli (gas layer) through various liquid layers in order to end up in the blood. Rishi is a pediatric infectious disease physician and works at Khan Academy. These videos do not provide medical advice and are for informational purposes only. The videos are not intended to be a substitute for professional medical advice, diagnosis or treatment. Always seek the advice of a qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read or seen in any Khan Academy video. https://cdn.kastatic.org/ka-youtube-converted/nRpwdwm06Ic.mp4/nRpwdwm06Ic.mp4 706 How organ systems work together https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:human-body-systems/e/apply-organ-system-interactions 2026-03-25T13:00:37.369559121Z Apply: organ system interactions Apply your understanding of organ system interactions in this set of free, standards-aligned practice questions. Megan Cohn exercise