Question

In which step of urine formation does excess of water, urea, glucose and amino acids are reabsorbed?

Answer 1

Depending upon the types of molecules being reabsorbed, movements into and out of epithelial cells in different segments of the nephron occurs either by passive transport or active transport in the Selective Reabsorption.

1. Water and urea are reabsorbed by passive transport.
2. Active transport reabsorbs glucose and amino acids.
3. The reabsorption of ${\mathrm{Na}}^{+}$occurs both by passive and active transport.

SELECTIVE REABSORPTION: The process where some molecules (e.g. ions, aldohexose, and amino acids), once being filtered out of the capillaries alongside element waste products (i.e. urea) and water within the capillary, area unit reabsorbed from the filtrate as they pass through the nephron.