https://www.khanacademy.org/science/health-and-medicine/circulatory-system/circulatory-system-introduction/v/meet-the-heart 2024-04-04T15:34:20.714536152Z Meet the heart! The heart, nestled between the lungs and protected by the rib cage, serves as a powerful pump ensuring blood flow throughout the body. This systemic flow delivers oxygen and nutrients to cells and removes waste. Additionally, the heart manages pulmonary flow, sending blood to the lungs for oxygenation before distributing it to the body. Lastly, the heart's own cells are nourished by coronary blood vessels, part of the systemic flow. Rishi Desai video https://cdn.kastatic.org/ka_thumbnails_cache/788d62ac-0d84-48ee-a35f-2b21e850a2b1_1280_720_base.png Meet the heart! The heart, nestled between the lungs and protected by the rib cage, serves as a powerful pump ensuring blood flow throughout the body. This systemic flow delivers oxygen and nutrients to cells and removes waste. Additionally, the heart manages pulmonary flow, sending blood to the lungs for oxygenation before distributing it to the body. Lastly, the heart's own cells are nourished by coronary blood vessels, part of the systemic flow. https://cdn.kastatic.org/ka-youtube-converted/Vi1JK6IYVt8.mp4/Vi1JK6IYVt8.mp4 609 The circulatory system https://www.khanacademy.org/science/health-and-medicine/circulatory-system/circulatory-system-introduction/v/layers-of-the-heart 2022-11-16T04:22:43.7414897Z Parts of the heart The heart's structure and function is complex. Blood flows through the heart in a specific pattern, thanks to valves that keep it moving in the right direction. Certain muscles and cords help keep the valves functioning properly. The heart's two ventricles are separated by the interventricular septum. Heart wall muscle is made up of three layers: the endocardium, myocardium, and pericardium. Rishi Desai video https://cdn.kastatic.org/googleusercontent/VGXyW9a-L6mUrbAL6-4i0D6h8ps71zhk4u9xdzpM2qEuRx5OEzFbo45NFNKvFlMMtHg-Xd6vSEExLfGtnhMUXu7w Parts of the heart The heart's structure and function is complex. Blood flows through the heart in a specific pattern, thanks to valves that keep it moving in the right direction. Certain muscles and cords help keep the valves functioning properly. The heart's two ventricles are separated by the interventricular septum. Heart wall muscle is made up of three layers: the endocardium, myocardium, and pericardium. https://cdn.kastatic.org/ka-youtube-converted/bm65xCS5ivo.mp4/bm65xCS5ivo.mp4 733 The circulatory system https://www.khanacademy.org/science/health-and-medicine/circulatory-system/circulatory-system-introduction/v/flow-through-the-heart 2020-09-09T23:28:12Z Flow through the heart Learn how blood flows through the heart, and understand the difference between systemic and pulmonary blood flow. Rishi is a pediatric infectious disease physician and works at Khan Academy. Rishi Desai video https://cdn.kastatic.org/googleusercontent/oZ6EhbCXlLF8nqwCrKPR1Z4ftBWhk54hdKa9fGwBCm5IRu2rqouGgpU9MTWst9rAQJyZW_7WHiSxn0aIX6dVYHZr Flow through the heart Learn how blood flows through the heart, and understand the difference between systemic and pulmonary blood flow. Rishi is a pediatric infectious disease physician and works at Khan Academy. https://cdn.kastatic.org/ka-youtube-converted/7XaftdE_h60.mp4/7XaftdE_h60.mp4 471 The circulatory system https://www.khanacademy.org/science/health-and-medicine/circulatory-system/circulatory-system-introduction/v/two-circulations-in-the-body 2020-09-09T23:28:10Z Two circulations in the body Learn the difference between the pulmonary and systemic circulatory systems in the body. Rishi is a pediatric infectious disease physician and works at Khan Academy. Rishi Desai video https://cdn.kastatic.org/googleusercontent/mpTwNM-GiJyQmDRIXf1kyOaQYokmQ3zJNvWyVnyXBlxHGcx-J_tn8DAvatBISnGDfBkFB1u9DT69gvjWMjLQ2R1A Two circulations in the body Learn the difference between the pulmonary and systemic circulatory systems in the body. Rishi is a pediatric infectious disease physician and works at Khan Academy. https://cdn.kastatic.org/ka-youtube-converted/K57qjYYjgIY.mp4/K57qjYYjgIY.mp4 745 The circulatory system https://www.khanacademy.org/science/health-and-medicine/circulatory-system/blood-vessels/v/arteries-vs-veins-what-s-the-difference 2023-09-10T17:11:17.624018169Z Arteries vs. veins - what's the difference? Explore the roles of arteries and veins in the circulatory system. Uncover common misconceptions about oxygenated and deoxygenated blood, and learn the true distinction: arteries carry blood away from the heart, while veins transport blood towards the heart. Delve into the high-pressure nature of arteries and the low-pressure, high-volume characteristics of veins. Rishi Desai video https://cdn.kastatic.org/googleusercontent/x2Vu8mDkRGVuCk7yG7tz8kKSROmZuOQ0BQtmxuIV3PM8BZLr_r1Aygs2JLAhiuV_8WXT_XPSDdR4eHmqW6_TO5ffIQ Arteries vs. veins - what's the difference? Explore the roles of arteries and veins in the circulatory system. Uncover common misconceptions about oxygenated and deoxygenated blood, and learn the true distinction: arteries carry blood away from the heart, while veins transport blood towards the heart. Delve into the high-pressure nature of arteries and the low-pressure, high-volume characteristics of veins. https://cdn.kastatic.org/ka-youtube-converted/lXkfZYlnwl4.mp4/lXkfZYlnwl4.mp4 464 The circulatory system https://www.khanacademy.org/science/biology/human-biology/circulatory-pulmonary/v/circulatory-system-and-the-heart 2024-05-06T19:22:43.24334365Z Circulatory system and the heart Hemoglobin, found in red blood cells, absorbs oxygen, increasing the diffusion gradient. This process encourages oxygen to cross the membrane. Hemoglobin is contained within red blood cells to prevent blood from becoming too thick. The blood flows from the heart to the lungs via the pulmonary artery, gets oxygenated, and returns to the heart via the pulmonary vein. The oxygenated blood is then pumped to the rest of the body. Sal Khan video https://cdn.kastatic.org/googleusercontent/QQ3kDKa7ct44EUTcIZwN312V1-RrEgNJruMr8OSIco3MqyTZIfh9-PUfndLKhLpV7f1nQNq58WmnIysS_iLr1Bd7Dw Circulatory system and the heart Hemoglobin, found in red blood cells, absorbs oxygen, increasing the diffusion gradient. This process encourages oxygen to cross the membrane. Hemoglobin is contained within red blood cells to prevent blood from becoming too thick. The blood flows from the heart to the lungs via the pulmonary artery, gets oxygenated, and returns to the heart via the pulmonary vein. The oxygenated blood is then pumped to the rest of the body. https://cdn.kastatic.org/ka-youtube-converted/QhiVnFvshZg.mp4/QhiVnFvshZg.mp4 897 The circulatory system https://www.khanacademy.org/science/hs-bio/x230b3ff252126bb6:from-cells-to-organisms/x230b3ff252126bb6:human-body-systems/a/hs-the-circulatory-system-review 2024-05-06T19:22:43.24334365Z The circulatory system review Learn about the organs and functions of the circulatory system. article https://www.khanacademy.org/science/mh-grade-8-science/x0f256b8de9c7cf34:human-body-and-organ-sysytem/x0f256b8de9c7cf34:circulatory-system/e/circulatory-system 2026-03-25T05:21:26.916040744Z Circulatory System Basics of the heart and the circulatory system. Joel Prakash Stephen exercise https://www.khanacademy.org/science/als-k-to-12-science/x46c2fc9f8e023990:2nd-quarter/x46c2fc9f8e023990:the-cardiovascular-system-structure-and-its-vital-functions/e/circulatory-system-questions 2024-11-18T16:44:21.627686931Z Circulatory system questions Circulatory system questions Lucas Philipp exercise