The blood passes through the heart once during each complete circuit e.g. Fish
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How many atria and ventricles does a fish heart have?
1 atrium & 1 ventricle- as there's only a single circulation and the blood passes thru the heart once in each circuit
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Double Circulatory System
blood passes thru heart twice during each complete circuit of body
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Advantages of Double? (evolutionary terms)
Evolutionary Terms: fish are older than mammals & its reasonable to assume that the double circulatory system evolved from the single-therefore its an improvement of it
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Advantages of Double?
blood travels thru capillaries-Pressure+Speed drop. Double:blood travels to 1 capillary network bfr returning to heart Single:blood travels thru 2 networks. So Double maintains a higher blood Pa/speed -maintains concen gradient-efficient exchange
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Open Circulatory System? (found in insects)
The blood is not always confined within blood vessels but also enters the body cavity(any fluid-filled space)
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What is the main blood vessel in Insects/Arthropods?
Dorsal Vessel- delivers blood
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Insect Blood
Haemolymph
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Name for Body Cavity in Insects
Haemocoel
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why doesn't the circulatory system in insects need to be v.efficient?
because the oxygen is delivered directly from the air to respiring tissue via tracheal system
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Closed Circulatory System (found in fish/mammals)
the blood circulates entirely within blood vessels
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Other cards in this set
Card 2
Front
How many atria and ventricles does a fish heart have?
Back
1 atrium & 1 ventricle- as there's only a single circulation and the blood passes thru the heart once in each circuit
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