General Knowledge · 3
Which of an octopus's three hearts stops beating when the animal swims?
Answer
The systemic heart
The systemic (or main body) heart of an octopus stops beating during swimming, forcing the animal to rely on anaerobic energy and making sustained swimming energetically costly. The two branchial hearts, which serve the gills, continue to function.
💡 Did you know?
Octopuses have three hearts: two pump blood to the gills, one to the body—and it stops when they swim.
Other options people guess
- The left branchial heart
- The right branchial heart
- All three hearts
Topics
- animals
- octopus
- marine-life
- biology
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