Blood, tissue fluid and lymph

Blood/plasma is comprised of...

• Oxygen
• carbon dioxide
• salt
• glucose fatty acids
• amino acids 
• hormones 
• plasma protiens
• erythrocytes 
• leucocytes
• platelets

Tissue fluid is comprised of...

• oxygen
• carbon dioxide
• small white blood cells ( neutrophils) 

How tissue fluid is formed

• Blood enters the arterial end of the capillary at a high hydrostatic pressure
• This high hydrostatic pressure pushes the tissue fluid and smaller things such as small white bloodcells through tiny gaps in the capillary wall
• This fluid bathes the tissues to allow the exchange of gases and neutrients across the cell surface membrane, this exchange occurs by diffusion and active transport
• Oxygen enters the cell…