Advertisements
Advertisements
Question
Why do arteries have thick and elastic walls whereas veins have valves?
Solution
The blood emerges from the heart under high pressure and flows through arteries. Hence, to bear this pressure the arteries have thick and elastic walls. Veins have valves to ensure that the blood flows in one direction only.
APPEARS IN
RELATED QUESTIONS
Why does the heart need valves?
You can see some blood vessels on the outside of the hands specially in older people. Are those veins or arteries ? How can you confirm your answer ?
Describe the functions of Red blood cells.
Describe the functions of Platelets.
Define the term Veins.
Name the organ from which oxygenated blood goes into the heart.
Name the following:
Components of blood
Describe the structural differences between an artery and a vein.
The diagram below represents a certain category of blood vessels showing the role of a special structure in their walls :
(i) Name the kind of blood vessels shown.
(ii) What is the structure shown inside the blood vessels?
(iii) What is the role of these structures?
(iv) Are these structures present in any other kind of blood vessel? If so, name it.
(v) Towards which side of the figure (Top or Bottom) is the heart located?
The pH of the blood is maintained by ____________.
