Which of the following cause(s) water to move from the glomerulus into the tubule?
1 An increase in pressure caused by the left ventricle of the heart.
2 The effect of blood proteins on the direction of osmosis.
3 An increase in pressure of the liquid in the tubule
I guess B is the answer.
Glomerulus filtration is caused only by force by blood pressure which is generated from left ventricle.
Blood is pumped from left ventricle, this creates systemic blood pressure.
The blood pressure becomes the hydrostatic pressure in the glomerulus, Hydrostatic pressure forces water and small solutes from the blood in the glomerulus into the tubule. so an increase of the pressure increases the filtration.
This is oncotic pressure cause by proteins in the vessels, especially Albumin, this pressure causes the absorption of water back in to the vessels due to concentration, so this is reabsorbing not filtering.
Oncotic pressure opposes Hydrostatic pressure.
An increase in the pressure of the liquid in the tubules acts the same as decreasing hydrostatic pressure .
Tubules pressure also opposes Hydrostatic pressure, more tubular pressure , more absorption.
So only 1 is correct.
