| ▲ | fluoridation 14 hours ago |
| I don't understand how the square-cube law is relevant here. The volume of blood indeed scales cubically with the length, but so does the volume of the heart. Where is the quadratic part of the equation that limits the maximum size of a whale? Why would it not work to take a whale and arbitrarily scale it in photoshop? |
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| ▲ | Qem 14 hours ago | parent [-] |
| > Where is the quadratic part of the equation that limits the maximum size of a whale? Muscle power output increases with cross section area, ~L^2, not with volume. The heart have no separate power unit. It relies on the same muscle walls that comprise its chambers to power itself. |
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| ▲ | fluoridation 14 hours ago | parent [-] | | That just means the walls of the heart would need to grow thicker. Are they at the limit already? | | |
| ▲ | Qem 14 hours ago | parent [-] | | Wall thickness increasing by x increases cross section/power by x^2, but also increases chamber volume/workload by x^3. So workload outruns available power. It's because of this people abusing steroids get heart failure eventually. | | |
| ▲ | fluoridation 14 hours ago | parent [-] | | >chamber volume/workload by x^3. So workload outruns available power. What do you mean by workload? Are you referring to the oxygen cost per stroke, or what? | | |
| ▲ | Qem 11 hours ago | parent [-] | | Power demand. Volume pumped each cycle * (systolic pressure - diastolic pressure) / time. | | |
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