BIOL 1002 Chapter : Chapter 33

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15 Mar 2019
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The act of breathing is called respiration. The process of cellular respiration, which converts the energy in nutrients into the. Atp used by cells, requires a steady supply of oxygen and generates carbon dioxide as a waste product. Consequently, the circulatory system works in close harmony with the respiratory system. The circulatory system extracts oxygen from the air in your lungs, carries it within diffusing distance of each cell, and then picks up carbon dioxide for release from the lungs. Gas exchange in all organisms ultimately relies on diffusion. Cellular respiration depletes co2 levels, creating a concentration gradient that favors the diffusion of co2 out of cells and the diffusion of o2 into them. Although animal respiratory systems are amazingly diverse, they all meet three requirements that facilitate diffusion. Respiratory surfaces remain moist so that gases can diffuse across cell membranes. The cells lining respiratory surfaces are very thin, to facilitate diffusion of gases through them.

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