10.2 Respiration and Gas exchange

Cards (9)

  • Describe gas exchange at the lungs and respiring cells.
    In the lungs, oxygen from the air we breathe enters the bloodstream, while carbon dioxide exits the bloodstream and is exhaled. In respiring cells, oxygen from the bloodstream enters the cells, and carbon dioxide produced by cellular respiration exits the cells into the bloodstream to be carried away.
  • The equation for & describe aerobic respiration.

    Aerobic respiration is the process where glucose reacts with oxygen to produce energy, carbon dioxide, and water. The equation is:
    Glucose + Oxygen -> Carbon Dioxide + Water + Energy
    • Know the % of gasses in the atmosphere.
    The approximate percentages of gasses in Earth's atmosphere are:
    Nitrogen: ~78%
    Oxygen: ~21%
    Argon: ~0.93%
    Carbon Dioxide: ~0.04%Other gasses (such as neon, helium, methane, krypton, hydrogen, xenon): collectively less than 0.1%
  • Describe how gas exchange occurs at the alveoli
    At the alveoli, oxygen from inhaled air diffuses into the bloodstream through thin capillary walls surrounding the alveoli, while carbon dioxide from the bloodstream diffuses into the alveoli to be exhaled.
  • Know why diffusion between the alveoli and capillaries is fast.
    Diffusion between the alveoli and capillaries is fast because the walls separating them are very thin, allowing molecules to move quickly across the membrane.
  • Know the equation for aerobic respiration
    The equation for aerobic respiration is:
    Glucose + Oxygen -> Carbon Dioxide + Water + Energy
  • Describe how gas exchange occurs at the respiring cells
    At respiring cells, oxygen from the bloodstream diffuses into the cells, where it is used in cellular respiration to produce energy. Carbon dioxide, a waste product of cellular respiration, diffuses out of the cells into the bloodstream to be carried away.
  • Know the composition of air.
    Air is mainly made up of nitrogen (about 78%) and oxygen (about 21%), with small amounts of other gasses like argon and carbon dioxide. 
  •  What is Aerobic respiration?
    A chemical process in which oxygen is used to make energy from carbohydrates (sugars)