The correct statement that describes arteries is: (d) They have thick elastic walls without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body.
Explanation: Arteries are designed to withstand high pressure due to the forceful pumping of blood from the heart, so they have thick, elastic walls. They also lack valves, as their primary function is to carry blood away from the heart to the rest of the body.
Why the other options are incorrect:
(a):
This statement is incorrect because arteries carry blood away from the heart, not towards it. Veins are responsible for collecting blood from organs and returning it to the heart.
(b):
This option is wrong because arteries have thick, not thin walls. Also, arteries have high pressure, not low pressure. Veins have thin walls and low pressure.
(c):
This statement is incorrect because arteries have high pressure, not low pressure. They also carry blood away from the heart, not towards it.