The most accurate statement regarding the differences in heart structure between frogs and humans, and how these differences influence physical activity levels and endurance, is:
a: The human heart's four chambers and double circulation probably support higher physical activity levels and greater endurance compared to the frog's three-chambered heart and incomplete double circulation.
Explanation:
-
Humans have a four-chambered heart consisting of two atria and two ventricles, which allows for complete separation of oxygenated and deoxygenated blood. This separation supports more efficient oxygen delivery to tissues, enabling higher metabolic rates and better endurance during prolonged physical activity.
-
In contrast, frogs have a three-chambered heart (two atria and one ventricle) that leads to some mixing of oxygenated and deoxygenated blood. Their circulatory system is less efficient, particularly during active periods, which can limit their ability to sustain high levels of activity.
Overall, the heart structure in humans is more adapted to support sustained aerobic exercise and endurance compared to that of frogs.
1 answer