Question

type of blood cell
blood vessels
​

Answer 1

Blood is made of cells and plasma. There are 3 main types of blood cells — red cells, white cells and platelets. All are made in the marrow found in many bones.

Red blood cells-deliver oxygen from the lungs to the rest of the body, and carry waste products to be released by the lungs or the kidneys. Red blood cells contain haemoglobin, which is the protein that binds and releases oxygen.

White blood cells-are part of the immune system. They detect and fight infections or foreign molecules that enter the body.

Platelets are small cells that help the blood clot.

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Answer 2

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Blood vessels: They are the network of pathway. 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.

• Arteries are not collapsible.

• 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.

• Veins are collapsible.

• 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 creates networks inside the body.

• The movement of capillaries are very slow in exchange of materials.

• They are very narrow blood vessels having endothelium.

• They have tiny pores which helps them for exchange of materials.

• They are responsible for the exchange of materials between blood and tissues.