blood pressure

• what is blood pressure/ peripheral resistance?

  • measure of hydrostatic force of blood against vessel walls.
  • contact between blood and vessel walls causes friction, slowing blood flow.
  • SIDE NOTE: arterioles/capillaries have greater surface area, resisting blood flow more to reduce pressure
• tissue fluid formation?

  • formed when plasma is forced out capillaries, carrying nutrients and oxygen with
  • cells absorb nutrients from tissue fluid and give out waste
  • tissue fluid moves back into capillaries via osmosis
  • 20% tissue fluid drains to blind-ended lymph cap, flowing through lymph vessels returning to lymph fluid to blood via thoracic duct.
  • build up of tissue fluid in tissues can cause swelling, aka oedema.