Question

1. Blood cells returning to the lungs after their journey through the body are.

bright blue

dark red

dark blue

bright red

Answer 1

The answer is Dark Red.

Step-by-step explanation:

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Answer 2

Dark Red

Step-by-step explanation:

The blood that travels back to the heart and lungs is dark red. It has picked up carbon dioxide from the body cells, and it has left most of its oxygen with the cells. We can think of the dark colored, carbon dioxide-rich blood as "used” blood. This is the blood that the heart pumps into the lungs.