The skeletal system comprises 206 bones and has two main parts ... Dr, Bailey is a Virginia-based physical therapist and professor of anatomy and physiology with over a decade of experience.

What Is the Nervous System? Your nervous system is your body's main communication system. It sends messages from your brain to the rest of your body and helps you respond to changes inside and ...

Lungs are part of the respiratory system, a group of organs and tissues that work together to help you breathe. You can live for two weeks without food, two days without water, but only two minutes ...