which type of blood vessel exchanges materials with cells?
capillaries
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what is the name of the red pigment in the red blood cells?
haemoglobin
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which blood vessels carry blood away from the heart?
arteries
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why does blood only flow in one direction?
because valves prevent the backflow of blood
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what is the function of white blood cells?
white blood cells are part of the bodies defence system
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what is transported by xylem
water and mineral ions (from roots to stem and leaves)
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what is transported by phloem?
food such as dissolved sugar (from leaves)
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why do humans have double circulation?
blood mut be circulated to the lungs to become oxxygenated, oxygenated blood must be returned to the heart to be pumped around the body
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some patients are fitted with a stent in a coronary artery, why?
a stent keeps the coronary artery open so that oxygenated blood can flow to the heart muscle
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why has it been necessary to develop artificial hearts?
because not enough people donate their organs
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if you were designing an artificial heart, what key features would you include?
two pumps, one to pump blood to the lungs and one to pump blood to the rest of the body, it would need valves, made of materials which do not cause an immune reaction
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Other cards in this set
Card 2
Front
what is the name of the red pigment in the red blood cells?
Back
haemoglobin
Card 3
Front
which blood vessels carry blood away from the heart?
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