Formation of Tissue Fluid

Question 1

Step 1

Answer 1

Blood enters capillaries from arterioles at high hydrostatic pressure. This blood has a high solute potential (so a low water potential) because plasma proteins stay in capillaries as they’re too big to pass through fenestrations.

Question 2

Step 2

Answer 2

Water wants to move into capillaries by osmosis. This is called on oncotic pressure.

Question 3

Step 3

Answer 3

The high hydrostatic pressure of blood at the arteriole end is HIGHER than the oncotic pressure. This means water cannot move in and instead fluid is squeezed out of the capillaries.

Question 4

Step 4

Answer 4

This TISSUE FLUID surrounds he cells in the tissues and formation of this fluid is called ULTRAFILTRATION.

Question 5

Step 5

Answer 5

Blood moves through capillaries to venus end, hydrostatic pressure is lowered due to fluid moving out.
Oncotic pressure stays the same. So it is higher than hydrostatic pressure so water moves back in by osmosis.

Question 6

Step 6

Answer 6

Now about 90% of the fluid is back into the blood vessels.