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GK Quiz: Which fascinating sea creature has three hearts and blue blood?
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News18•17-10-2026, 17:46
GK Quiz: Which fascinating sea creature has three hearts and blue blood?
- •The octopus is a unique marine animal that possesses three hearts in its body.
- •Two of its hearts pump blood to the gills for oxygen, while the third pumps oxygenated blood to the rest of the body.
- •An octopus has eight arms with suckers and a soft body that allows it to squeeze through tiny spaces.
- •Unlike humans, octopus blood is blue due to a copper-containing protein used for oxygen transport.
- •Octopuses are highly intelligent creatures capable of changing their skin color and texture to hide from predators.
Key Questions Answered
The octopus is a unique sea creature that features three hearts, eight arms, and distinct blue blood. Two of its hearts pump blood through the gills for oxygen, while the third heart circulates oxygenated blood throughout the rest of its body.
An octopus relies on three hearts to circulate blood efficiently. Two branchial hearts pump blood through the gills to collect oxygen, and a third systemic heart distributes the oxygen-rich blood to the remainder of the body.
Unlike human blood which is red due to iron-containing hemoglobin, octopus blood appears blue because it utilizes a copper-containing protein called hemocyanin to transport oxygen.
