Question

Which of the following type of blood vessel that carries deoxygenated blood to the heart? *

Answer 1

Brief concept understanding :-

• The blood vessels are elastic muscular tubes which carry blood . There are three kinds of blood vessels in human body

1) Arteries :- Arteries are thick walled blood vessels which carry blood away from the heart for distribution to the body

• The walls of arteries, particularly those near the heart , are thick that enables them to dilate but not to rupture when the heart contracts and forces blood into them. Thus, The blood passing through narrow lumen of arteries is aerated and has a considerable pressure.

2) Veins :- Veins are thin walled blood vessels which brings blood from the body back to the heart. They are larger and hold more blood than arteries. The blood passing passing through the wide lumen of veins is non aerated and has low pressure. It flows slow and steady. The veins have valves that allow the blood to flow only towards the heart and prevent the back flow.

3) Capillaries :- Capillaries are thin walled and extremely narrow blood vessels which occurs at the terminal of artery and veins. They join the arteries and veins together. They form a vast network of blood vessels. The walls of capillaries are permeable to water and dissolved substances so that the exchange of material between the blood and body cells take place. The blood also flows very slow which faciliates the exchange of food materials, gases and waste products.

Answer :-

The largest vein vena cava carries deoxygenated blood to heart.

This process take place as when the muscles of all four chamber of the heart are relaxed, the blood returning to the heart under low pressure in veins enters the two atria. Blood from large veins called vena cava , pours into right atrium. This blood comes from head, upper body parts and lower body parts where oxygen has been used up and the blood is free from oxygen i.e deoxygenated. Thus, The deoxygenated blood enters the right atrium. At the same time, the pulmonary vein from lungs pours oxygenated blood into the left atrium. This the oxygenated blood pours into left atrium and deoxgenated blood moves out $.$

Answer 2

Answer:

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▶ The largest vein vena cava carries deoxygenated blood to the heart