Topics: The Circulatory System Quiz
Prevents the backflow of blood and ensures that blood flows only in one direction.
A. valves
B. aorta
C. ventricle
D. atrium
Select your answer:
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Circulatory System › View
Name part B.
A. Pulmonary arteries
B. Pulmonary veins
C. Superior Vena cava
D. Aorta
Brain › View
What part of the eye sits on the outer surface of the cornea and lines the eyelids. This structure produces mucous
A. iris
B. lens
C. retina
D. conjunctiva