Summary
Summary The circulatory system
- Course
- Life Science
- Institution
- St Stithians College (Stithian)
The IEB curriculum contains the circulatory system. These notes helped me get an A in biology
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Circulatory systemBlood vessels
Arteries
Carries blood at high
pressure away from the
heart
Stretch to allow blood
and then returns back to
normal (pulse)
Carries oxygenated
blood (* pulmonary
artery)
Divides into arterioles
Vein
Carries blood at lower
pressure towards the
heart
Have semi- lunar valves which prevent blood flowing backwards (because on
little/no pressure)
Carries deoxygenated blood (* pulmonary vein)
Capillary
Arteries >> arterioles >> capillaries
Liquid part of blood (plasma and leukocytes) leak out and bathe cells = tissue
fluid
Walls of capillaries thin and have pores allows for interchange of
substances
Capillary bed = capillaries that come from arteriole
Capillaries unite at venues which lead to veins
, Heart
NB// mirror image
Closed system of tubes (red blood cells cant leave)
Right side
Responsible for Circulation of deoxygenated blood
Right atrium = thin walled and receives deoxy blood from
Superior vena cava
Inferior vena cava
Coronary vein
Right atrium to right ventricle via tricuspid valve (three flaps attached by
heart tendons to the inner wall of ventricle) : (valve allows for blood to flow
only 1 way)
Right ventricle to lungs via pulmonary artery (allows to be oxygenated)
Base or pulmonary artery = semi lunar valve (blood can only flow 1 way)
Left side
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