WHAT'S INSIDE: HUMAN BODY
- Body Parts
- Body Systems
Creatinine is a chemical molecule that is present in the serum (liquid portion) of the blood. The amount of creatinine produced depends on a person's muscle mass. But how is it measured?
Made up of airways, lungs, muscles, and blood vessels, your respiratory system is the mechanism that lets you breathe. How much do you know about the respiratory system?