Which best explains the circulation system within mammals?

A. Mammals use a closed, single-loop circulatory system aided by a four-chambered heart.

B. Mammals use a closed, double-loop circulatory system aided by a four-chambered heart.

C. Mammals use an open, double-loop circulatory system aided by a four-chambered heart.

D. Mammals use a closed, single-loop circulatory system aided by a three-chambered heart.

Question

Chemistry

Sage

24 July, 00:51

Which best explains the circulation system within mammals?

A. Mammals use a closed, single-loop circulatory system aided by a four-chambered heart.

B. Mammals use a closed, double-loop circulatory system aided by a four-chambered heart.

C. Mammals use an open, double-loop circulatory system aided by a four-chambered heart.

D. Mammals use a closed, single-loop circulatory system aided by a three-chambered heart.

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Answers (1)

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Ayla Kelley · Answer 1

B. Mammals use a closed, double-loop circulatory system aided by a four-chambered heart.

double loop because blood flows through the heart twice during one complete circulation.