Question

The separation of the atria and ventricles helps to:

• A. Prevent mixing of the blood.
• B. Pump blood only to lower parts of the body.
• C. Pump blood only to upper parts of the body.
• D. Both A and C.

Answer 1

The correct option is A Prevent mixing of the blood.

• The two upper chambers are called the atria (singular: atrium) and the two lower chambers are called the ventricles.
• The partition between the chambers helps to avoid mixing up blood rich in oxygen with blood rich in carbon dioxide.

Thus, the correct answer is option A.