Question

Draw a table to show the similarities and differences between single and double circulatory systems.

Accepted Answer

Single and double circulation:
                SimilaritiesDifferences
                Both are types of closed circulation - blood stays enclosed in vessels and does not come into direct contact with tissues Both have exchange occur at capillariesBoth involve a pumping organBlood flows thru the heart once for complsoeting one circulation in single circulation, in double it flow thru the heart twice for completion of one circulationIn single circulation the heart consists of two chambers, in double it is 3 or 4In single circulation oxygenated blood flows directly from source of oxygen (gills) to capillaries, in double circulation oxygenated blood flows from lungs into the heart and then into the bodySingle occurs in fish, double occurs in frogs, reptiles, birds and mammalsBlood is at lower pressure in single circPulmonary circulation is absent in single and present in doubleBlood flows at higher pressure & therefore more rapidly than in single

Single Double Circulation Blood Flows Heart Similarities Differences