Atria

The frog circulatory system consist of two atria and one single ventricle. It is the only organ within the coelom which has its own protective covering. The single ventricle is not divided into two compartments like a humans heart, but it is separated ...

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In amphibians like frog,during blood circulation 2 atria contract and pump blood into single ventricle(heart is 3 chamberd).In the ventricle mixed blood is formed.How does mixed blood is circulated to various body parts via aorta?

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... frankly. I'll be generous and sauce you an answer, it's the pace setter because it Delays the contraction of the ventricles to ensure that the atria have pumped its blood into them. Don't ask a bunch of questions without showing that you atleast have some clue as to what you know

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Yes congratulations on 4! I'm afraid I don't really know for 2. Contractions in the atria at a basal level are caused by the SA node (which is part of neither system), but it is affected by parasympathetic from the vagus to slow it down, and sympathetic to speed it ...

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Okay I'll do the 4. questions first because I'm relatively sure I can answer them correctly. The SA node sends a signal via the atrial-ventricular node (AV) down the purkinje fibres in the centre of the heart, causing it to contract from the bottom upwards (so the ventricles can empty ...

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