Tissue fluid

Question 1

at the arterial end of a capillary bed

Answer 1

• blood is under high hydrostatic pressure
  forcing fluid out of the capillary into the
  tissue
• low solute potential so low oncotic
  pressure so water moves into the
  capillary through osmosis
• hydrostatic pressure greater than oncotic
  pressure so fluid is forced out of the
  capillary through the gaps between the
  endothelium cells

Question 2

at the venous end of a capillary bed

Answer 2

• hydrostatic pressure is lower as a large
  amount of water has left the blood
• oncotic pressure is still high due to
  plasma protein.
• oncotic pressure greater then the
  hydrostatic pressure so water moves out
  the capillary by osmosis
• about 10% goes into the lymph capillaries