Daily Archives: April 25, 2010

Circulatory and Respiratory Systems

 

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This week we start learning more about the transport systems in both plants and animals. All living organisms need to move nutrients, dissolved gases and wastes around their bodies – smaller organisms by diffusion and active transport, but multicellular organisms require more complex systems. The circulatory system of mammals includes  a four-chambered heart, arteries, veins and capillaries that allow the movement of blood to every cell within the body. The respiratory system includes the lungs, trachea, bronchi and alveoli that allow the transfer of oxygen and carbon dioxide between the internal blood supply and the external environment.

A YouTube video of How the Circulatory System works.

Links to more great resources about the Human Body Systems (compiled by Jackie Miers)

How Stuff Works – How your Heart Works.