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Respiratory system physiology
Place your hand on your ribs and inhale deeply. You’ll notice that your chest expands and your back straightens. As this occurs, air is rushing through your windpipe and branches off to either your left or right lung. After 20 to 30 more branch points, oxygen in the air ends up in the alveoli where it diffuses into the liquid that surrounds the alveoli, and slips into the blood. This microscopic gas exchange occurs rapidly, oxygen is taken into the body and carbon dioxide is removed from the body, and then you exhale. Learn more about the intricate and fascinating respiratory system in these videos!
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Homeschoolers widely appreciate Khan Academy for its extensive free resources covering a broad range of subjects and grade levels, including test prep and advanced topics. Many praise its clear video lessons and interactive exercises that allow self-paced learning. However, some families find the platform less structured and requiring significant parental oversight to ensure consistent progress. Additionally, while the content quality is generally high, a few users note that the presentation can feel dry or overly academic for younger learners. Overall, Khan Academy is valued for accessibility and depth but may need supplementation for a fully rounded homeschool curriculum.
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