<prompt> Answer this question truthfullyIn the context of fluid exchange and kidney function, what is the meaning of the abbreviation PBS?  <response>: <reason> In the context of fluid exchange and kidney function, the abbreviation PBS stands for Bowmans space hydrostatic pressure. This pressure is the force exerted by fluid within Bowmans space, which is the space between the glomerular capillaries and the Bowmans capsule in the kidney. Bowmans space hydrostatic pressure opposes the filtration of fluid into the Bowmans capsule, and it is one of the factors that influences glomerular filtration rate GFR. PBS helps to regulate the amount of fluid that is filtered by the kidneys and ultimately excreted as urine. 