Which part of the body never stops working, even when we sleep?

What gives blood its red color?

How many bones are there in the adult human body?

What connects muscles to bones?

Which organ helps balance the body and is located in the inner ear?

What is the longest bone in the human body?

What part of the body is responsible for filtering blood?

Which part of your eye helps you see colors?

Which muscle is used for breathing?

How much of the human body is made up of water (approximately)?