Chapter 5 - Section 5.6 - Exchange at the Capillaries - Check Your Progress - Page 106: 3

Osmotic pressure is greater than blood pressure at the point where the capillary meets the vein. Because of this imbalance of pressure, interstitial fluid flows back toward the capillary. Almost the same amount of fluid that left the capillary will return to it, but some of the interstitial fluid is collected by the lymphatic capillaries. This interstitial fluid in lymphatic vessels is called lymph, and it is returned to the blood when the major lymphatic vessels enter the subclavian veins.

Osmotic pressure is greater than blood pressure at the point where the capillary meets the vein. Because of this imbalance of pressure, interstitial fluid flows back toward the capillary. Almost the same amount of fluid that left the capillary will return to it, but some of the interstitial fluid is collected by the lymphatic capillaries. This interstitial fluid in lymphatic vessels is called lymph, and it is returned to the blood when the major lymphatic vessels enter the subclavian veins.