Question

Fill in the blanks.

(xix) ________ get collapsed when empty.

Answer 1

Blood vessels:

1. A network of tube-like structures that transport blood from the heart to the tissues and from the tissues to the heart are called blood vessels.
2. The blood vessels in the body are of three types namely - arteries, veins, and capillaries.
3. These blood vessels play an inevitable role in transporting the blood throughout the body.

Veins:

1. Veins are the blood vessels that carry deoxygenated blood (except the pulmonary vein) from other organs to the heart.
2. The veins are inelastic- and thin-walled and have a large lumen.
3. Hence, the veins can easily get collapsed when they are empty without blood.

Veins get collapsed when empty.