Question

Differentiate between filtration, reabsorption and secretion. Include location for each term and a brief function for each term.

Answer 1

1. Filtration.

The kidney is the body's blood filtering system.

Blood vessels visit the kidney and enter a special ball of capillaries called the glomerulus.

Glomerulus is nestled within a region of the kidney called the bowman's capsule.

Filtration occurs in bowman's capsule.

Blood is pushed through the tiny capillaries ,the high pressurw forces some things to pass through the capillary walls.

water ,sugar ,salt ,aminoacids ,nitrogenous wastes ,and other tiny things enter the kidney as a substance called the filtrate.

2. Reabsorption.

The filtrate enters the kidney in the proximal convoluted tubule. This region of the kidney is special because many things can be removed from the filtrate.

Glucose , certain salts , vitamins , hormones and amino acids are restored to the body.

Reabsorption occur in Distal tubule ,henle's loop, collecting duct also.

3. Secretion.

The filtrate then passes through a really neat structure called loop of henle, and enters the distal tubule , where secretion occurs.

Mainly Hydrogen ion, potassium are mainly secreted in to the filtrate.