Q1.Why are arteries thick walled and veins thin walled? Q2. Why do blood flows at high pressure inside the arteries and at low pressure inside the veins? Q3. How do blood helps in removing waste from our body?
1. Blood is pumped into the arteries with a lot of pressure and the thickness helps the arteries to sustain such pressure. Veins are thin walled as they carry deoxygenated blood towards the heart and experience less pressure comparable to that of arteries.
2. As the arteries carry blood away from heart and veins bring blood towards heart. The heart pumps blood with high pressure. So the blood in the arteries has a higher pressure than the blood in the veins.
3. The blood carries the wastes produced during respiration in tissues and cells like to lungs and extra water and urea to the kidneys. The CO2 is removed through lungs during exhalation and urea is excreted through excretory system (kidney, ureters, urinary bladder and urethra). For more details on excretory system, kindly refer to the study material on our website at the following link