What is the function of the one-way valves in veins?
A. Ensuring the flow of blood can only go back to the heart
B. Creating a difference in pressure between the veins in the chest and abdominal cavities
C. Assisting in the distribution of blood to different organs
D. Regulating blood clotting
Select your answer:
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Hospitality › ViewHow many portions of fruit and vegetables should we eat?
A. 5 a week
B. 5 a day
C. 10 a day
D. 2 a day
Human Organs › View
The _____________________ is the body system that helps a person move and maintain posture.
A. nervous system
B. muscular system
C. digestive system
D. nervous system