Cardiovascular / Circulatory System

Cardiovascular / Circulatory System
Includes:

Heart
Blood
Arteries 
Veins
Capillaries

What it Does:

The cardiovascular system circulates  blood around the body delivering oxygen and nutrients to organs and cells and carrying carbon dioxide and waste products away.
It also protects the body from infection and blood loss, and helps maintain a constant temperature and fluid balance.

What Could go Wrong:

High blood pressure
High cholesterol
Coronary artery disease
Heart attack
Arrhythmia
Heart failure
Heart valve disease
Stroke
Angina