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CIRCULATORY SYSTEM (Blood Vessels (Vein (Carry deoxygenated blood expect…
CIRCULATORY SYSTEM
Blood
is a fluid tissue
Plasma
about 90% is water
To dissolve and transport water
Red Blood Cell (RBC)
Produced in bone marrow
Destroyed at the spleen
Transport oxygen
Contain Haemoglobin
Limited life span of 120 days
Has biconcave shape and does not contain nucleus
White Blood Cell (WBC)
Produced in bone marrow
Colourless
Irregular shape
Contain Lymphocytes and Phagocytes
Limited life span of a few days
Platelets
Small
Prevent bleeding
Contain tiny fraction of blood
Blood Vessels
Arteries
Small lumen
Blood flows rapidly
Carry blood away from heart
Blood move in pulses
Have thick muscular walls with so much elastic tissue
Capillaries
Large lumen
No pulse
Blood flows slowly
Link arteries to veins
Blood changes from oxygenated at the ateriole end to deoxygenated at the venule end
Vein
Carry deoxygenated blood expect pulmonary vein
Large lumen
Have thin muscular walls with little elastic tissue
Carry blood towards the heart
Blood flows slowly
No pulse
Heart
Features of heart
Aorta
Right atrium
Pulmonary artery
Left ventricular
Tricuspid valve
Pulmonary veins
Inferior vena cava
Left atrium
Pulmonary semi-lunar valve
Right ventricle
Superior vena cava
Aortic semi-lunar valve
Bicuspid (Mitral) valve
Atria
Right atrium
Receive deoxygenated from the rest of the body
Left atrium
Receive oxygenared blood from the lung
Ventricles
Right ventricle
Pump deoxygenated blood into the lungs
Left ventricle
Pump oxygenated blood to the rest of the body