A brain heater in the swordfish

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Science  18 Jun 1982:
Vol. 216, Issue 4552, pp. 1327-1329
DOI: 10.1126/science.7079766


The brain and eye of swordfish are warmer than the water. Associated with one of the eye muscles is a tissue that heats the brain. This brain heater is rich in mitochondria and cytochrome c and is supplied with blood through a vascular heat exchanger. It protects the central nervous system from rapid cooling during daily vertical excursions which may take the swordfish through a wide temperature range.

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