Make your own free website on
Tour of the Human Body Systems

The Tour Starts Here!

The Immune System
The Nervous System
The Excretory System
The Respiratory System
The Circulatory Syatem
The Digestive System
The Skeletal System
The Muscular System
Glossary of Terms
The Circulatory Syatem


Blood Title

Welcome to the main road system which runs around Humansville and to and from all the main structures.  From here you can go anywhere you want to.  All you have to do is catch a ride on Highway B.

Bloody HR

The Main Attractions

  • A liquid, blood to help transport
    • nutrients
    • wastes
    • oxygen and carbon dioxide
    • hormones
  • Two pumps 
    • one to pump deoxygenated blood to the lungs;
    • the other to pump oxygenated blood to all the other organs and tissues of the body.
  • A system of blood vessels to distribute blood throughout the body
  • Specialized organs for exchange of materials between the blood and the external environment; for example
    • organs like the lungs and intestine that add materials to the blood and
    • organs like the lungs and kidneys that remove materials from the blood and deposit them back in the external environment.

Diagram of the Heart
Anatomical diagram of heart  
The Heartbeat
The heart muscle pumps the blood through the body by means of rhythmical contractions and relaxations or dilations. The heart's left and right halves work almost synchronously. When the ventricles contract, the valves between the atria and the ventricles close as the result of increasing pressure, and the valves to the pulmonary artery and the aorta open. When the ventricles become flaccid during diastole, and the pressure decreases, the reverse process takes place.

Pulmonary circulation is the movement of blood from the heart, to the lungs, and back to the heart again. 
Systemic circulation supplies nourishment to all of the tissue located throughout your body, with the exception of the heart and lungs because they have their own systems.