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Formation of Urine Stage 1: Filtration Solutes and water move from the ___________ into the __________________________________. Dissolved solutes move from areas of ____________ pressure to areas of ____________ pressure. o __________ times greater pressure than in a normal capillary bed. Stage 2: Reabsorption Solutes and water move from the _________________ back into the __________. ___________ of fluid flows through the kidneys each minute. ___________ (20%) is filtered into the nephrons. o ___________of urine is formed. o ___________is reabsorbed. Reabsorption of water and solutes are regulated and adjusted in response to _______________signals. Can be ________________ or ________________. Occurs until the _________________________________of a substance is reached. _________ is actively reabsorbed; negative ions (Cl- & HCO3-) follow. Glucose and amino acids are actively transported out of the ______________________________. An ________________________________ forms and pulls water into the interstitial fluid (__________). ______________________________ create another osmotic gradient that draws water from the ISF and into the blood. Remaining solutes in filtrate become ________________ concentrated. Stage 3: Secretion Movement of wastes from the ________________ into the ________________ via active transport. o Primarily ________________________________. Includes nitrogenous wastes, excess H+ and K+ ions. Question One: Does everything contained within the glomerulus filter into the Bowman’s capsule? Question Two: Does everything that was filtered into the Bowman’s capsule form into urine? Question Three: The last stage involves the movement of wastes from the blood back into the nephron. This primarily occurs via active transport. Which organelle is likely found in high concentration within the cells that line the tubules involved with secretion?
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