Why do most molecules of urea and uric acid remain in the nephron, when they are there in higher concentrations than the peritubular capillaries?

What is the difference between filtration and reabsorption? Explain how hydrostatic, osmotic (or colloid oncotic), and osmosis influence fluid transport across the nephron.

Describe how and where water, organic compounds, and ions are reabsorbed and secreted in the nephron.

most filtered water is reabsorbed in the kidney. which segment o a nephron achievES THE BULK OF THIS REABSORBTION, and how is this achiebed?

What is the structure of the nephron where nutrients and wastes are taken out of the blood and put into the nephron?

The presence of either protein or glucose in a urinalysis is abnormal, but these two molecules end up in the urine for different reasons. For each of these molecules, briefly describe where in the urine production process (i.e., glomerular filtration, tubular reabsorption or tubular secretion) the problem occurs, and why it might happen.

Na+ ions are actively transported out of the tubules to help set up the countercurrent multiplier. Which of the following are sites of active Na+ ion transport in the nephron?

explain the perneability of the descending and ascending limbs of nephron loop to water and NaCI.  how does it affect the osmolarity of the filtrate in each limb?

Fluid is now at the end of the nephron tubule system and is now called the what at its final form?

If nephrons lacked a nephron loop, what would be the effect on the volume and solute (osmotic) concentration of the urine produced?