Frequently Asked Questions
Hemoglobin is a protein that contains iron, which allows it to pick up oxygen from the air we breathe and deliver it everywhere in the body. It is found in red blood cells, and gives red blood cells their colour, too.
The main function of the circulatory system is to provide oxygen, nutrients and hormones to muscles, tissues and organs throughout your body.
Respiratory gases like oxygen and carbon dioxide (from and to the lungs). Nutrients (from the digestive system). Waste materials (from different body parts to the excretory system). Hormones (from glands to different parts of the body).
The valves prevent blood from flowing backward. The heart has four valves. The tricuspid valve separates the right atrium and right ventricle. The mitral valve separates the left atrium and left ventricle
