Q1. To prevent blood from flowing backward veins and the heart are equipped
with valves that closes automatically.
Q2. Breathing and other forms of muscular activity contribute to venous blood
flow.
Q3. Mitral (bicuspid) valve.
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Explanation:
1Ans). aortic valve: The aortic valve is one of two valves that control the flow of blood as it leaves the heart. (The other is the pulmonary valve.) These valves work to keep the blood flowing forward. They open up to let the blood move ahead, then close quickly to keep the blood from flowing backward.
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