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 membrane from a region of their lower concentration to a region of their higher concentrationâin the direction against the concentration gradient. Active transport requires cellular energy to achieve this movement. There are two types of active transport â primary active transport that uses ATP, and secondary active transport that uses an electrochemical gradient. An example of active transport in human physiology is the uptake of ...