Body Transport System - Science Learning 8

Learn Body Transport System questions with answers. This prep guide includes questions like, what happens after exchange of substances?, what is vein?, what is pulmonary vein?, how does blood flow in arteries?, what are properties of blood in arteries? and others below.

Body Transport System Learning 8

Question: What happens after exchange of substances?

Answer: After the exchange, the capillaries join again and form a large vein. The vein takes the deoxygenated blood towards the heart.

Question: What is vein?

Answer: Vein is a blood vessel with thin walls and broad lumen. Veins contain deoxygenated blood with low pressure, due to its low pressure there is a risk of backward flow of blood. To prevent this backward flow, vein have uni-directional valves which prevent blood from flowing back.

Question: What is pulmonary vein?

Answer: Like pulmonary artery, there is a pulmonary vein as well. All veins carry blood towards the heart, and all veins carry deoxygenated blood except for the pulmonary vein which carries oxygenated blood from lungs to the heart.

Question: How does blood flow in arteries?

Answer: In arteries, blood flows with high pressure. This is why it is said that the blood in the arteries flows in pulses.

Question: What are properties of blood in arteries?

Answer: Except for pulmonary artery, the blood in the arteries is bright red colored because it contains oxygen in high concentration, carbon dioxide and water in low concentrations.