In a fish, electrical impulses that cause the heart to contract are initiated in theMultiple choice question.sinus venosus.SA node.conus arteriosus.ventricle.

What is the first structure that contracts in a fish heart?Multiple choice question.The sinus venosusThe atriumThe conus arteriosusThe ventricle

The AV node releases an electrical impulse to cause the contraction of which chambers of the heart?ventriclesatria

Select all that applyThe heartbeat originates in the remnant of the sinus venosus known as the sinoatrial node in which of the following animals?Multiple select question.BirdsMammalsFishAmphibians

Conduction of impulses between the atria and the ventricles is channelled through the a. Annulus fibrosus b. AV node c. SA node d. Bundle of His

Describe two ways in which the circulatory system of a fish is different from the circulatorysystem of a mammal