Once the Metabolite Enters The Capillary

The cardiovascular or circulatory system is designed to ensure the survival of all cells of the body at each second and it does this by maintaining the fast chemical surroundings of every cell within the body (i.e., home SPO2 device the interstitial fluid) at a composition applicable for that cell's normal function. Oxygen availability is usually a limiting factor for cell survival, and it is mostly supplied to a cell by passive diffusion. As oxygen molecules diffuse into the cell, they're consumed, home SPO2 device so that there is a progressive fall in oxygen concentration from the floor of the cell to the bottom focus which happens at the middle of the cell. For a spherical cell with a typicaldiffusion coefficient for oxygen (≈10−5 cm2/s) and an oxygen consumption of resting skeletal muscle (≈10−2 ml O2 cm−3 min−1), the important measurement (radius) which is simply adequately equipped with oxygen from the encircling medium is about 1 mm.

Thus, we find that diffusion places an upper limit on the size of cells in regard to their want for oxygen. 60