human transport system

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  • Created by: vanessa
  • Created on: 16-12-13 12:34
what are the four components of blood
platelets, red blood cells, plasma, white blood cells
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what are two adaptations of red blood cells
biconcave shape so have more surface area, and no nucleus
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what are the two components of white blood cells
lymphocytes and phagocytes
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how do white blood cells stop disease
lymphocyte recognises the antigen on the pathogen and creates antibodies. The phagocyte recognises the antibodies and engulfs it (phagocytosis)
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what are platelets responsible for
clotting
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why is clotting important
stop entry of pathogens and losing blood
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why do we have a double circulatory system
there is less pressure on the heart
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why do we have valves?
they stop blood going the wrong way
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which way does arteries and veins carry blood
arteries away and veins to the heart
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describe the lumen in the arteries and veins
a small lumen in arteries with high blood pressure, and a wide lumen in veins with low blood pressure
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what does a capillary do
exchange nutrients and waste products with the cells
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what is an adaptation of a capillary
the wall is one cell thick
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what is the order of the circulatory system!
left atrium, left ventricle, pulmonary vein, aorta, hepatic artery, iliac artery, iliac vein, hepatic vein, inferior vena cava, superior vena cava, pulmonary artery, right atrium, right ventricle
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what are three factors affecting heart rate
exercise, adrenaline, smoking
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what is a danger with smoking
the carbon monoxide binds to the haemoglobin blocking oxygen from binding
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what are two adaptations of red blood cells

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biconcave shape so have more surface area, and no nucleus

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what are the two components of white blood cells

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how do white blood cells stop disease

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what are platelets responsible for

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