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Summary Life science summery of the circulatory system
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Detailed summery of the circulatory system based on both IEB text books as well as extra notes taken in class
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Grade 11 Life sciences - Life Sciences (Biology)
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Grade 11 Life sciences - Life Sciences (Biology)
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Circulatory systemsDifferent systems
Open circulatory system
In molluscs and arthropods including insects
Blood is pumped from heart into blood vessels and into the body
cavity (haemocoel)
The blood leaves the blood vessels and bathes the internal organs
allowing exchange of nutrients, waste and gasses
Movement of the body muscles makes the blood move
In open blood flows slowly due to large blood filled hemocoel
Blood pressure is low, so it limits this system to smaller animals
Closed circulatory system
In earthworms and vertebrate animals
From heart to blood vessels which reach all body tissues
Larger vessels branch into capillaries which occur between cells for
exchange of gases, nutrients and waste
Blood flows back to the heart in blood vessels with valves to ensure
blood only flows in one direction towards heart
After blood has circulated through the body it is pumped to lungs
under high pressure to absorb oxygen
Hight rate of oxygen rich blood flow through the body makes it
possible for birds and mammals to maintain high level of activity
Human circulatory system
Three main components: Heart = pumping organ
Blood vessels = tubes where
blood flows
Blood = fluid which is transport
medium
Humans have closed blood systems where blood is limited to blood
vessels (high rate of oxygen rich blood flow: high level of activity)
Humans have a double circulatory system with two main systems
Double circulatory system
, Pulmonary circulatory system
Blood flows from heart to lungs and back
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