Question

Select the incorrect statements:
A. Arteries have thick elastic walls and veins have valves.
B. Capillaries are the smallest blood vessels supplying the tissues.
C. AV nodes are known as the pace setter of the heart.
D. Arteries carry blood towards the heart and veins carry blood away from the heart to different organs.
A. A and B
B. A and C
C. C and D
D. D only

Answer 1

Hint: Arteries and veins both carry blood. Veins carry blood for oxygenation and arteries carry out oxygenated blood.

Complete Answer:
Arteries carry oxygenated blood i.e. oxygen rich blood away from the heart to supply it to different organs and veins carry deoxygenated blood back to heart for oxygenation.
Veins enter into the heart by carrying deoxygenated blood. Deoxygenated blood enters into the right artery and then reaches the right ventricle via the tricuspid valve.
This deoxygenated blood gets oxygenated and leaves the heart to supply blood to other organs of the body. The oxygenated blood is rich in oxygen and nutrients.
The heart is at the centre of our circulatory system which is a network of blood vessels that delivers blood to every part of the body.
The cardiac muscles of the heart pumps blood throughout the circulatory system. Arteries and veins are two of the body’s main types of blood vessels. These vessels are channels that distribute blood to the body.

Out of the above given statements, D is incorrect.

Note: Arteries carry blood away from heart and veins carry blood to heart for oxygenation.