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  1. The respiratory system review (article) | Khan Academy

    The process of physiological respiration includes two major parts: external respiration and internal respiration. External respiration, also known as breathing, involves both bringing air into the lungs …

  2. Cellular respiration (article) | Khan Academy

    Review your understanding of cellular respiration in this free article aligned to NGSS standards.

  3. Khan Academy | Khan Academy

    Explore the steps of cellular respiration, including glycolysis, Krebs cycle, and electron transport chain, in this comprehensive guide from Khan Academy.

  4. Introduction to cellular respiration and redox - Khan Academy

    In cellular respiration, electrons from glucose move gradually through the electron transport chain towards oxygen, passing to lower and lower energy states and releasing energy at each step. The …

  5. Cellular respiration introduction | Biology (video) | Khan Academy

    The chemical reaction for cellular respiration involves glucose and oxygen as inputs, and produces carbon dioxide, water, and energy (ATP) as outputs. There are three stages to cellular respiration: …

  6. Intro to cellular respiration (article) | Khan Academy

    Cellular respiration is a biological process in which cells break down glucose in the presence of oxygen, releasing stored chemical energy. This energy can be used to power cellular processes.

  7. Cellular respiration (video) | Khan Academy

    Cellular respiration is the process by which the body gets energy from food. It is a series of chemical reactions that happen in our cells, converting glucose from our food and oxygen from the air we …

  8. Aerobic & anaerobic respiration (video) | Khan Academy

    Even though in our daily terms, we might associate respiration with breathing but in biology, they're two different things. So what exactly is respiration then?

  9. Aerobic & anaerobic respiration (video) | Khan Academy

    Even though in our daily terms, we might associate respiration with breathing but in biology, they're two different things. So what exactly is respiration then?

  10. Respiratory system anatomy and physiology | Khan Academy

    Breathing control Peripheral chemoreceptors Central chemoreceptors The respiratory center