Question

what are blood vessels ​

Answer 1

Answer:

Hope that it will help you!!!

Explanation:

Blood vessels are the channels or conduits through which blood is distributed to body tissues. The vessels make up two closed systems of tubes that begin and end at the heart. One system, the pulmonary vessels, transports blood from the right ventricle to the lungs and back to the left atrium.

Answer 2

$\huge\bf{Answer :}$

${\bigstar}$Blood vessels: Human blood flows inside tubes called blood vessels.

Blood vessels are classified into three types :

• Arteries
• Veins
• Capillaries

Arteries :

• An artery carries oxygenated blood from the heart to organs except for the pulmonary artery.

• They do not have valves.
• Blood flows rapidly in the artery.
• Blood flows with je-rks and under pressure.
• Arteries have thick, elastic, and muscular walls.

Veins:

• Vein brings deoxygenated blood from organs to the heart except for the pulmonary vein.

• They have valves.
• Blood flows slowly in the vein.
• Blood flows smoothly with little pressure.
• Veins have thinner walls than arteries.

Capillaries :

• An artery divides and redivides into smaller fine branches termed as capillaries.

• They have valves to avoid the backflow of blood.
• Capillaries form networks inside the body organs.
• They are very narrow blood vessels having endothelium.
• They are responsible for the exchange of materials between blood and tissues.