6 votes

A creature has one heart per bodily extremity. How large does each have to be?

This is already the case in the human body, to a limited extent. The pumping action of the blood through the arteries is not just restricted to the heart. The muscles all along the arteries contract ...
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6 votes

How can a creature have an efficient bird like respiratory system without hollow bones?

Sure. The main advantage of the avian respiratory system over the mammalian one is that the airflow is unidirectional. This is a huge advantage for oxygen transfer, but it's a challenge to get there ...
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4 votes

How can a creature have an efficient bird like respiratory system without hollow bones?

A bird's respiratory system is about 8x as efficient as ours A bird's lungs and air sacs take up twice as much of a bird's volume as a terrestrial mammal's lungs. A bird's pneumatic bones are also ...
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4 votes

A creature has one heart per bodily extremity. How large does each have to be?

The case of the Extra Hearts: Some creatures, like the octopus, already have multiple hearts. In the case of the octopus, this is to compensate for hemocyanin, which is less efficient than hemoglobin ...
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4 votes

A creature has one heart per bodily extremity. How large does each have to be?

The torso heart would still be almost the same size as a human heart's. This is because the blood volume that needs to be circulated in the unit time remains the same, so the work to do remains ...
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4 votes

A creature has one heart per bodily extremity. How large does each have to be?

The size of the heart of a creature the size of the limb. A heart has to counter the resistance of the circulatory system. This is in large part the capillaries, the smallest blood vessels that ...
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  • 412
3 votes

Humanoid Race with Surpressed Myostatin Gene - Appearance?

I am the first female to score a rushing touchdown in a male high-school varsity football game. I was 4'11" 130 lbs and even a starter my junior year as a fullback and outside linebacker. I ...
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2 votes

Would 25% less gravity produce dramatic differences in animal morphology?

Everything weight only 3/4 as much as the same mass would on Earth. Thus, for a given mass that must be supported, and constant material strength, compressive structures can be about 87% small in ...
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1 vote

Would 25% less gravity produce dramatic differences in animal morphology?

Here is a frame challenge to the idea that 75 percent of Earth's surface gravity is the minimum possible for a planet that can keep a dense atmosphere for geological eras of time. Part One: the ...
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1 vote
Accepted

How can a creature have an efficient bird like respiratory system without hollow bones?

You don't need pneumatic bone (hollow bone) to have air sacs. air sacs evolved before hollow bones, pneumatic bones is just a useful extra thing you can do with air sacs once you have them, (you can ...
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