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Some insects, like the crickets pictured below, have such slender antennae it seems no blood could fit. How do they get blood through their antennae?

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Insects do not posses closed circulatory system, but a space where organs float in a fluid called hemolymph. They don't have blood vessels (but some arthropodes have pumps that act a like heart). The hemolymph allows nutrients and excretion products to diffuse, but usually doesn't serve as a means to transmit oxygen to the tissues.

In insects, the oxygen is pumped through a series of little tubes named tracheae. Trachae connect the tissue directly to the air, allowing gas diffusion efficiently.

Antennae and wings have very little metabolic needs, mainly because (in the first case) they're formed by some neurons. Movement is achieved by muscles located in the base of the antenna (where it doesn't have circulation issues). The nerve tissue has the neuron bodies located in the basis too, so the nutrients and oxygen can diffuse through the axon.

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Insects primarily get oxygen through diffusion of air through their skin. I doubt the antennae need hemolymph circulation.

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References, please –  J. Musser Jun 21 at 23:42
    
the answer above this one? lol –  shigeta Jun 22 at 0:59
    
"I doubt the antennae need hemolymph circulation." doesn't sound very scientific. Can you add references, or explain why a little better? –  J. Musser Jun 24 at 22:53
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