As the fluid flows down the renal tubule, water and some chemicals are reabsorbed from the tubular fluid into the blood by diffusion.
Additionally, tissue oxygenation depends on adequate arterial oxygenation and total blood flow, diffusion of oxygen across capillaries and the distribution of microcirculatory flow.
For these molecules, blood flow, diffusion, and binding all occur much faster than extravasation, which is the rate-limiting step in uptake[16].
Stress hyperglycemia results in a new glucose balance, allowing a higher blood 'glucose diffusion gradient' that maximizes cellular glucose uptake in the face of maldistributed microvascular flow [ 23].
Greater depletion of nitrite found in the argon chamber samples raises the possibility that nitrogen reactive species may enter the stored blood via diffusion from the atmosphere through the gas-permeable PVC bags, as confirmed by our saline solutions.
Non-malignant, collagen-producing fibroblasts outside the blood oxygen diffusion range converted most, but not all, of their bodies into erythrosomes; remnants of the cytoplasm remained, and sometimes mitochondria were present during the ongoing erythrogenic process.
Because of their need for oxygen and nutrients for survival, mammalian cells are located within 100 to 200 μm of blood vessels the diffusion limit for oxygen (Folkman, 1971).
They also have a shorter blood-water diffusion distance, a complex capillary-muscle fiber geometry that significantly increases the ratio of capillary surface area to muscle fiber volume in the red muscle [67], and high levels of myoglobin [68].
By definition, convection leads to removal of Ca2+ from the blood; by contrast, diffusion from the blood or to the blood depends on the so-called inlet dialyser diffusion concentration gradient between Ca2+D and plasma water Ca2+ [ 62].
The transfer of oxygen from alveolar air into the capillary blood occurs by diffusion across the tissue barrier; it is driven by the oxygen partial pressure difference between alveolar air and capillary blood and depends on the thickness (about 0.5 micrometre) and the surface area of the barrier (about 130 square metres in humans).
