Describe and explain how the human kidney is involved in excretion and how it regulates the concentration in blood?

Expert Answers

An illustration of the letter 'A' in a speech bubbles

Tiny cells in the kidneys called nephrons filter the blood, they are composed of the glomerulus and the tubule. You have thousands of nephrons in each kidney. The glomuruli act as the main filter and reabsorb substances such as proteins and water. The kidneys also concentrate urine, the amount of concentration depends...

Unlock
This Answer Now

Start your 48-hour free trial to unlock this answer and thousands more. Enjoy eNotes ad-free and cancel anytime.

Start your 48-Hour Free Trial

Tiny cells in the kidneys called nephrons filter the blood, they are composed of the glomerulus and the tubule. You have thousands of nephrons in each kidney. The glomuruli act as the main filter and reabsorb substances such as proteins and water. The kidneys also concentrate urine, the amount of concentration depends on your fluid intake.

The kidneys also play a role in acid - base balance of the blood by excreting waste products that your body doesn't need and retaining (sending back to the bloodstream) electrolytes that the body does need. This is called the buffering action of the renal system. Buffer systems help to prevent vast changes in the pH of the blood thereby acting as a homeostatic mechanism.

Approved by eNotes Editorial Team