Respiration - Internal respiration

brief notes on internal respiration

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Internal Respiration

Diffusion gradients exist between muscles and tissues/ working muscles. Oxygen diffuses from the blood vessels to the working muscles and carbon dioxide diffuses in the opposite direction.

Factors that contribute to the efficiency of diffusion are:

  • Large surface area of alveoli
  • Thin membranes
  • Short distance for diffusion to take place over

The arterio - venous difference indicate the efficiency of oxygen uptake by the muscles during exercise. At rest, only 25% of oxygen is used. During exercise 80% is used.

Arterio venous difference = measurement of relative amounts of blood between arterial and venous blood.

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