venous blood

By respiration the black venous blood is transformed into red arterial blood and regenerated.

This slow circulation of venous blood continues during the whole period of hibernation.

In other cases mixture of arterial and venous blood results, producing the so-called “blue babies.”

What is the difference between venous blood and arterial blood?

The blood circulating through the body is of two different kinds; the one red or arterial, and the other dark or venous blood.