How does insect pump their blood ?
Descricd the single circulation of fish
Descricd the double circulation of mammals
what is pulmonary circulation ?
what is systemic circulation ?
Describe human circulatory system
what is systole ?
what is diastole ?
Role of arteries
Role of veins
Describe two ways in which the structure of an artery differs from the structure of a vein.
The function of blood
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