PMT tissue formation

• Tissue fluid 


  A liquid containing dissolved oxygen and nutrients

  • which serves as a means of supplying the tissues with the essential solutes in exchange for waste products such as CO2
• When is hydrostatic pressure created?

  When blood is pumped along the arteries, into arterioles and then capillaries
• What does hydrostatic pressure do?

  Forces blood fluid out of capillaries.
• Components of tissue fluid are

  Only substances which are small enough to escape through the gap in a capillary
• Examples of tissue fluid components

  Dissolved nutrients like :

  • amino acids
  • fatty acids
  • ions in solution
  • glucose
  • oxygen
• The fluid is acted on by what?

  hydrostatic pressure which pushes some of the fluid back into the capillaries
• What water potential does tissue fluid have and why?


  As both the tissue fluid and blood contain solutes, they have a negative water potential

  • Although the water potential of the tissue fluid is negative, it is less negative in comparison to the blood (the blood contains more solutes
  • = tissue fluid is positive in comparison to blood
  • = causes water moves down the water potential gradient from the tissue fluid to the blood by osmosis
• What does the lymphatic system contain?

  Lymph fluid (Similar in content to tissue fluid)

  • has less oxygen & nutrients in comparison to tissue fluid
• what happens to the remaining tissue fluid that is not pushed back into the capillaries?

  carried back via lymphatic system
• lymphatic system contains


  • lymph fluid
  • lymph nodes
• lymph nodes- role 


  filter out bacteria and foreign material from the fluid

  • with the help of LYMPHOCYTES
• lymphocytes 


  destroy pathogens

  • as part of the immune system defences