Body Systems Year 9: Circulatory System

Circulatory system, system that transports nutrients, respiratory gases, and metabolic products throughout a living organism, permitting integration among the various tissues.

A classic way to think about the human body is to think about it as like a miniature city. Individuals in a city are like the different cells of your body. Groups of individuals work in offices, doing different jobs just like organ systems, which are made of many cells perform different jobs within your own body. So what is the city equivalent of the circulatory system?

The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart.

Blood is pumped away from the heart at high pressure in arteries, and returns to the heart at low pressure in veins. The human circulatory system is a double circulatory system.

irculatory system is a network that carries blood throughout the body. All animals except the simplest kinds have some type of circulatory system.