Approximately How Many Cities with Over One Million Residents Does

question 54

Multiple Choice

Approximately how many cities with over one million residents does the world presently have?

• A) three
• B) 24
• C) 151
• D) 500

---

Definitions:

Left Atrium

The upper left chamber of the heart that receives oxygenated blood from the lungs and pumps it into the left ventricle.

Left Ventricle

The chamber of the heart responsible for pumping oxygenated blood to the body.

Mitral Valve

A valve in the heart that lies between the left atrium and the left ventricle, regulating blood flow.

Veins

Blood vessels that carry blood towards the heart, as opposed to arteries which carry blood away from the heart.