2.75 Urine

Urine - Water, Salts,Urea

The amount of salt + H2O affects the composition of tissue fluid.

The removal of urea is part of the process of excretion of metabolic waste

The composition of urine depends on the conditions of which a person is operating.

2.74 ADH

ADH - Anti Diurectic Hormone

Produced in the Brain (specifically the hypothalamus area) and through the blood stream it gets carried to the Kidney.

ADH - control or alters the quantity of water in the blood

The collecting Duct - part of the Nephron. Where the ADH works

It is possible to incease the amount of water re-absrobed back into the blood, by applying ADH.

ADH makes the collecting ducts walls more porous so that more water can escape.

As a consequence: urine is more concentrated and in lower volume 

Summary: With ADH secretion, more water goes back into the blood, but urine becomes more concentrated with lower volume as well

2.73 Glucose Re-absorbtion

Selected Re-absorbtion - the glucose is taken from the Glomerula filtrate and sent back into the blood

In the Proximal Convoluted Tubule, the Glucose in the Glomerula Filtrate is re-absrobed into the blood, as normally there  would be no glucose in Urine

2.71 Water re-absorbtion

The Glomera Filtrate (glucose, H20, salts and urea) in the Bowmans Capsule makes its way to the collecting ducts.

Water is re-absorbed into the blood in the collecting duct.

                               "Water re-absorbtion occurs in the collecting duct"

Question: is it high pressure in the nephron that makes the glomera filtrate move on to the collecting duct?
Yes. Fluid entering the BC is in pressure. 

2.71 Ultrafiltration

Ultrafiltration - the filtration of molecules

The nephron - filtration of blood (into filtered blood + urea < Separate things)

The Bowmans capsule 

(where filtration begins)

               

The high pressure caused by the different sized tubes, forces the plasma (water, salts, amino acids, glucose and urea) out of the blood vessel and into the bowmans capsule 

2.70 Nephron Strucutre

Nephron - structural part of the kidney that does the filtration and controlling of composition of blood

The kidney is made up of millions of tubular structures (tubes) called Nephrons

The nephron as a closer look: 

There are millions of such nephrons in the kidney.