biology 2

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describe an insects open system
blood is pumped along long dorsal the length of the body the bloody is pumped into spaces called haemocoil within the body caverty,the blood reached the tissuses directly and the blood is pumped back to the heart,
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decribe an insects open system.........
little or no control over the blood directio, does not have a respiritory pigment and does not transport oxygen in the blood
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describe closed sysem
bloody is puped by the heart at high pressures so there is a high flow rate, organs do not come in caontact with the blood, it conatins repieritory pigment
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describe closed in worm
the earthworm has dorsal and vessles running along the body, the vessels are connected to the 5 pseudo hearts and the heaets pump the blod around the body
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what has a single closed circulatory ssytem and how does it work
fish has it, deoygenated bloody flows to the gills, oxygenated blood flows to the tissues and the dexogensated blood flows back tp the heart, blood is carried to the heart once
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what has a double closed circulatory ssytem and how does it work
humans, right side of the heart carries deoxegneated blood to the lungs, oygenated blood returns to the haet and the oygenated blood goes to the tissues and deoxygehnated blood is carried to the heart agaon blood gpoes through heart twice
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what does the human cirlcuatory system use the pump of the heart for
to sustain high pressure
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what does the human cirlcuatory system use the valves for
to control the flow of blood
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what does the human cirlcuatory system use the vessles for
to distobute the blood
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decribe arteries
carries blood away from the heart, large thick can with stand high presssure
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describe cappileries
cappileries connect to venules and returns blood to the heart
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structure of arties and veins
inner layer called endotherium one cell thick to reduce friction and maximise blod flow, middle layer is made up if elestic fibre to with stand bloodflow and the outer layer is amde up of collagen to prevent stretching
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what do veins have that arteries dont
have valves to prevent flow back
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structure of capilleries
excahnge materials form blood to tissues, small diameter but large sectional cross area due to capillary bed
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decribe an insects open system.........

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little or no control over the blood directio, does not have a respiritory pigment and does not transport oxygen in the blood

Card 3

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describe closed sysem

Back

Preview of the front of card 3

Card 4

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describe closed in worm

Back

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Card 5

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what has a single closed circulatory ssytem and how does it work

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