Skip Navigation

Balances and Glassware for Solution Preparation

Author(s): David R. Caprette, PhD
Showing Results for: balances Return to Presentation

Human Excretory System

Normal metabolic activity generates waste products that must be eliminated to sustain homeostasis. Ammonia (a product of protein metabolism) is converted to urea for elimination. Carbon dioxide, generated from cellular respiration, is removed from the lungs. Excess water and salts must be eliminated in order to maintain osmotic and pH balance.

The skin removes water, salts and nitrogen wastes in the form of sweat. 

The lungs eliminate carbon dioxide, water vapor and heat in exhaled air.

The kidneys excrete the majority of metabolic waste products from the body. Each kidney contains about one million functional filtering units called nephrons.