Single circuit heart is found in_________?
Correct answer: A. Fishes
- A. Fishes
- B. Amphibians
- C. Reptiles
- D. Mammals
Explanation
Fish have a two-chambered heart and a single circulatory circuit: heart to gills, gills to body tissues, and body tissues back to the heart. Amphibians, reptiles and mammals have double circulation, although reptiles and amphibians may have incomplete separation. Students may choose amphibians because their hearts are less completely divided, but they still possess pulmonary and systemic circuits.
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About Human Heart
The human heart is a four chambered muscular pump that maintains double circulation through the pulmonary and systemic circuits. Questions cover atria, ventricles, valves, major blood vessels, the cardiac cycle, pressure changes, the conduction system and ECG, while distinguishing arteries and veins from the chambers that receive or eject blood.
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