Bluefin Tuna and Mackerel Sharks Are Considered to Be Endothermic

Multiple Choice

Bluefin tuna and mackerel sharks are considered to be endothermic fish because their

A) lateral swim muscles heat cool venous blood, thereby elevating their body temperature above the surrounding water temperature.
B) abdominal swim muscles heat cool venous blood, thereby matching their body temperature to the surrounding water temperature.
C) lateral swim muscles cool warm arterial blood, thereby elevating their body temperature above the surrounding water temperature.
D) lateral swim muscles heat cool arterial blood, thereby elevating their body temperature above the surrounding water temperature.
E) lateral swim muscles heat cool arterial blood, thereby matching their body temperature to the surrounding water temperature.