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level: Gas exchange and transport

Questions and Answers List

level questions: Gas exchange and transport

QuestionAnswer
Define capillariesCapillaries are blood vessels. They transport blood, nutrients and oxygen to cells in your organs and body systems.
Define alveoliAir sacs at the end of the bronchioles. The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.
What are bronchioles?A tiny branch of air tubes in the lungs.
Define gas exchangeThe physical process by which gases move passively by diffusion across a surface.
Define haemoglobinA protein of red blood cells that contains iron and carries oxygen from the lungs to the tissues and carbon dioxide from the tissues to the lungs.
What common features do structures involved with gas exchange have?Large surface area relative to the volume of the organism. Thin (have a short diffusion pathway) A moist surface (so gases can dissolve first before they diffuse in or out)