Cardiac conduction is a process where electrical impulses activate cardiac tissue and the impulse transmits along a specific pathway to initiate cardiac contraction. Ectopic foci is a term used to describe impulses that originate from a source other than the usual pacemaker. Where can ectopic foci originate?

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answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.