Question

The correct sequence of urine formation in human body is

• A. Water reabsorption $\to$ Ultrafiltration $\to$ Reabsorption and secretion
• B. Water reabsorption $\to$ Reabsorption and secretion$\to$ Ultrafiltration
• C. Ultrafiltration $\to$ Reabsorption and secretion $\to$ Water reabsorption
• D. Ultrafiltration $\to$ Water reabsorption $\to$ Reabsorption and secretion

Answer 1

The correct option is C Ultrafiltration $\to$ Reabsorption and secretion $\to$ Water reabsorption

The correct sequence of urine formation in human body is

1. Ultrafiltration - Blood undergoes filtration through the pores of the glomerulus and as a result, the glomerular filtrate is formed.

2. Reabsorption and secretion - Materials like glucose, amino acids etc. that are to be retained in the body are reabsorbed completely and sodium, potassium, calcium ions, and water are absorbed partially into peritubular capillaries.

3. Water reabsorption - Excess water seen in the glomerular filtrate is filtered and as a result, glomerular filtrate changes to urine.