Blood!
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Viset little fejk blood in one straw (vein / artery) and said that if you wear a special pair of binoculars so you can & nbsp; see the blood in our "sensory bowl".
Red blood cells carry oxygen from the lungs to the rest of the body (we have already talked about the heart, lungs and oxygen before this event)
White blood cells turn against the infection so that we become healthy again (talked about how one gets sick of "contagion" before this event)
Platelets are like patches and if you get a wound so the blankets again wounded.
Plasma helps blood flow preferentially in arteries and veins.
