tissue fluid

Question 1

define tissue fluid

Answer 1

water liquid that contains glucose, amino acids, fatty acids, ions

Question 2

explain the formation of tissue fluid

(6 marks)

Answer 2

• arterial end of the capillary has high hydrostatic pressure caused by the heart pumping
• water and other molecules (CO2, glucose) move from blood to tissues ULTRAFILTRATION
• the water potential of the blood is lowered as proteins and cells remain when water leaves
• water potential of tissue fluid is higher than water potential of blood at venus end of capillary so water moves into blood by osmosis
• excess water in tissue fluid moves into lymph and returned to blood

Question 3

define ultrafiltration

Answer 3

only allows small molecules to be forced out of capillaries

leaving all cells and proteins in the blood