The diagram given below shows three types of blood vessels ( $P, Q$ and $R$ ) in the human circulato

Question

The diagram given below shows three types of blood vessels ( $P, Q$ and $R$ ) in the human circulatory system. Assign the following characteristics to these blood vessels and select the correct option.\ (i) Has single-celled thick wall\ (ii) Has valves to prevent back flow\ (iii) Carries blood under high pressure\ (iv) Pulses as blood flows through it\ (v) Can be blocked by fatty acids; condition known as atheroma\ (vi) Carries blood to the heart\ (vii) Has thick and muscular walls\ (viii) Allows amino acids to cross the walls

Professor PC Thomas Classes · Answer

(a)