A brain heater in the swordfish.
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.
D000064:Acclimatization; D000273:Adipose Tissue / Q000502:physiology; D000818:Animals; D001833:Body Temperature Regulation; D001921:Brain / Q000502:physiology*; D005399:Fishes / Q000502:physiology*; D006358:Hot Temperature; D009928:Organ Specificity; D012160:Retina / Q000502:physiology; D013045:Species Specificity