Chapter 39 - Physiology, Homeostasis, and Temperature Regulation - 39.4 - Body Temperature Depends on the Balance between Heat In and Heat Out of the Body - 39.4 Recap - Learning Outcomes - Page 836: 3

The anatomy of fish that utilize countercurrent exchange includes a mechanism that passes heat from the warm venous blood into the cold arterial blood so that both are maintained at the same temperature. This allows heat in the fish to be transferred with maximum efficiency and preserved even if the surroundings are at a lower temperature.

The anatomy of fish that utilize countercurrent exchange includes a mechanism that passes heat from the warm venous blood into the cold arterial blood so that both are maintained at the same temperature. This allows heat in the fish to be transferred with maximum efficiency and preserved even if the surroundings are at a lower temperature.