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Slide 8/28
How does fluid escape out of blood vessels?

  • The smallest blood vessels are known as capillaries.
  • Blood contain substances that "hang on" to fluid. This ability is known as "oncotic pressure"
  • The pressure within the heart during filling is reflected back to the capillaries (capillary pressure)
  • Blood will stay within capillaries as long as the capillary pressure is lower than the oncotic pressure
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