B3.2.11 (HL)—Tissue fluid in capillaries Topic Practice
B3.2.11 (HL)—Tissue fluid in capillaries Topic Practice
Students practise explaining capillary fluid exchange using hydrostatic and osmotic pressure gradients—and why ~90% of tissue fluid returns near venule ends.
How this is tested
- explain how plasma proteins generate osmotic pressure that draws tissue fluid back into capillaries
- predict direction of net fluid movement at arteriole vs. venule ends using hydrostatic pressure differences