-
Looking for HSC notes and resources? Check out our Notes & Resources page
filtration and reabsorption? (1 Viewer)
- Thread starter MiSSi
- Start date
Filtration of the blood occurs in Bowman's capsule where high blood pressure in the glomerulus forces all small molecules out of the blood into the capsule. Water, urea, ions (Na+, K+, Cl - , Ca2+, HCO3 - ), glucose, amino acids and vitamins are all small enough to be moved into the glomerular filtrate. Blood cells and proteins are too large to be removed. This filtering process is non-selective and therefore many valuable components of the blood must be recovered by reabsorption.
Reabsorption takes place selectively at various points along the proximal tubule, loop of Henle and distal tubule.
All glucose molecules, amino acids and most vitamins are recovered, although the kidneys do not regulate their concentrations. The reabsorption of the ions Na+, K+, Cl - , Ca2+ and HCO3 - occurs at different rates depending on feedback from the body. In some cases, active transport is required. Water is reabsorbed in all parts of the tubule except the ascending loop of Henle. The amount of water reabsorbed depends on feedback from the hypothalamus. If no water were reabsorbed human would soon dehydrate, losing water at a rate of around 7.5 L per hour.
The chemical composition of the body fluids is precisely regulated by the control of solute reabsorption from the glomerular filtrate.
I got this from NSW HSC online: http://hsc.csu.edu.au/biology/core/balance/
They have very good bio notes, its worth taking a look
Reabsorption takes place selectively at various points along the proximal tubule, loop of Henle and distal tubule.
All glucose molecules, amino acids and most vitamins are recovered, although the kidneys do not regulate their concentrations. The reabsorption of the ions Na+, K+, Cl - , Ca2+ and HCO3 - occurs at different rates depending on feedback from the body. In some cases, active transport is required. Water is reabsorbed in all parts of the tubule except the ascending loop of Henle. The amount of water reabsorbed depends on feedback from the hypothalamus. If no water were reabsorbed human would soon dehydrate, losing water at a rate of around 7.5 L per hour.
The chemical composition of the body fluids is precisely regulated by the control of solute reabsorption from the glomerular filtrate.
I got this from NSW HSC online: http://hsc.csu.edu.au/biology/core/balance/
They have very good bio notes, its worth taking a look
crazylilmonkee
Active Member
- Joined
- Aug 21, 2003
- Messages
- 1,121
- Gender
- Female
- HSC
- 2003
calcium ions and hydrogenate carbonate ions