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The main difference between single circulatory systems and double circulatory systems is that in the
case of single circulatory systems, blood passes through the heart only once on each circuit around
the whole of the blood circulation system of the animal
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Neurogenic vs Myogenic heart- In a neurogenic heart, nervous input is required for the heart to
contract whereas in a myogenic heart, the heart is capable of generating a cardiac contraction
independent of nervous input
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Portal circulation: any part of the systemic circulation in which blood draining from the capillary bed
of one structure flows through a larger vessel(s) to supply the capillary bed of another structure
before returning to the heart
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This can cause a condition known as erythroblastosis fetalis, where the mother’s white blood
cells attack the baby’s red blood cells as they would any foreign invaders
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Catching it early can ensure a successful
pregnancy for mother and child
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