Question

3. What is the function of a valve?
4. How are arteries different from veins?​

Answer 1

Explanation:

valves will prevent the backward Flow of blood.As the blood which is carried by valves contain deoxygenated blood ( less amount of oxygen) .

hope this helps u

Answer 2

Explanation:

valves works like a stopper which stops our blood to come in backward direction.

arteries :

• arteries have a thick elastic walls
• arteries do not have any valves
• arteries transport oxygenated blood to all over the body. except, pulmonary arteries transport deoxygenated blood to the lungs from the heart

veins :

• veins have a thin elastic walls
• veins have valves because in veins the blood pressure is low.
• veins bring back deoxygenated blood from all over the body. except, pulmonary veins brings the blood back to the heart from lungs.