I think the answer you are looking for is the glomerulus.
Blood flows in capillaries, but there is blood leaks out from the capillaries, known as tissue fluid or interstitial fluid.
blood
False, would increase the amount of fluid leaving the capillaries.
Tissue Fluid
the lymhpatic system
The glomerulus is a cluster of blood capillaries in the kidney that filters blood to form urine. It helps in the initial stage of urine formation by filtering out waste products, toxins, and excess substances from the blood while retaining necessary molecules like water and electrolytes. The filtered fluid, known as glomerular filtrate, is then processed further in the nephron to form urine for excretion.
This process, known as filtration, is driven by the pressure difference between the blood inside the capillaries (hydrostatic pressure) and the fluid in the tissue spaces outside the capillaries (osmotic pressure). The hydrostatic pressure pushes fluid out of the capillaries, while the osmotic pressure in the tissue spaces helps to prevent excessive fluid loss by drawing fluid back in.
The principle force that causes movement of fluid from tissues into capillaries is oncotic pressure. This pressure is generated by the presence of proteins in the blood that draw fluid back into the capillaries by osmosis.
Blood
The fluid that flows into lymphatic capillaries is called interstitial fluid. This fluid is derived from blood plasma that leaks out of capillaries into the surrounding tissues, where it bathes cells and facilitates nutrient and waste exchange. As interstitial fluid accumulates, it is collected by lymphatic capillaries and transformed into lymph, which then travels through the lymphatic system.
Fluid enters the lymphatic system (this system returns fluid and proteins to blood) by diffusing into lymph capillaries. This fluid is now called lymph and is kind of like interstitial fluid in composition. This movement of fluid is determined by net balance. It only diffuses into the capillaries if there isn't enough fluid there to begin with.
Tissue fluid or interstitial fluid, though blood leaks out as well x