â¢ Kidney Disorders: Hematuria may also be caused by damage to the upper urinary tract or an infected kidney. â¢ Bladder and Kidney Cancer: The presence of blood in the urine might also indicate bladder cancer or kidney cancer. However, this is a more common concern in people older than 40 years of age.
Facilitated Diffusion. Facilitated Diffusion is another form of passive transport where many polar molecules diffuse with the help of integral proteins in the lipid bilayer. The two main types of this kind of transport are ion channels and gated channels.
Active transport is the movement of molecules across a cell membrane in the direction against some gradient or other obstructing factor (often a concentration gradient).he difference between passive transport and active transport is active transport requires energy and moves substances against their respective concentration gradient, whereas passive transport requires no energy and moves substances in the direction of their respective concentration gradient.