The Cardiovascular System

The Cardiovascular System

The cardiovascular system's job in the human body is to provide the whole body with oxygen, nutrients and hormones. It is made up of three parts:

    • The Heart is the main organ of the body, it pumps blood through it.
    • Blood vessels including veins, arteries, and capillaries all contain blood that is pushed through the body.
    • Blood is a fluid that is pumped through the body.

There are three types of blood cells:

    • Red blood cells are responsible for carrying oxygen and carbon dioxide.
    • White blood cells are cells of the immune system that help fight viruses or diseases.
    • Platelets are fragments of cytoplasm, and they help heal cuts and stop clots.

The heart has three main types of cells:

    • Pacemaker cells fire impulses at intervals to cause the heart muscle to contract.
    • Smooth muscle cells compose the heart and allow it to contract.
    • Endothelial cells form a thin, protective layer on the inside of the heart that prevents blood from sticking and forming clots.