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A-Level Biology OCR A

Pressure Oncotic Draw Label Annotate Diagram Explain Movement

At the arterial end of a capillary, hydrostatic pressure (4.6 kPa) is higher than oncotic pressure (-3.3 kPa), causing fluid to be forced out of the capillary into the tissue space.

En el extremo arterial del capilar, la presión hidrostática (4.6 kPa) es mayor que la presión oncótica (-3.3 kPa), lo que hace que el líquido sea forzado a salir del capilar hacia el espacio tisular.

Front Draw, label and annotate diagram to explain the movement of liquid out of a capillary.
Back Arterial end:
  • Hydrostatic pressure is at about 4.6kPa bc it is still under pressure from surge of blood every time heart contracts
    • It is higher than oncotic pressure so fluid is squeezed out of the capillaries - tissue fluid 
  • Oncotic pressure is about -3.3kPa due to presence of plasma proteins

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