Final answer:
The tubular reabsorption mechanism is responsible for water reabsorption throughout the nephron, primarily in the proximal convoluted tubule, and regulated by ADH in the collecting ducts.
Step-by-step explanation:
The tubular reabsorption mechanism is responsible for water reabsorption throughout the nephron.
In the proximal convoluted tubule (PCT), water and most nutrients are reabsorbed by passive or active transport. Sodium (Na+) is actively transported out of the tubule, and water follows it due to osmotic pressure. Water is also reabsorbed into the peritubular capillaries through aquaporins, which are water channels.
In the collecting ducts, water recovery is regulated by the hormone ADH. Depending on the body's fluid status, the collecting ducts can recover none or almost all of the water reaching them.
The tubular reabsorption mechanism is responsible for water reabsorption throughout the nephron. This process is tightly regulated by hormones such as ADH (antidiuretic hormone) and aldosterone. The reabsorption of water primarily happens passively through concentration gradients, but hormones provide regulation, particularly in the collecting ducts.
Most of the water reabsorption occurs in the proximal convoluted tubule (PCT), loop of Henle, and distal convoluted tubule (DCT). In the collecting ducts, under the influence of ADH, variable amounts of water can be reabsorbed depending on the body's hydration status, with the potential to recover almost all remaining water.