Why is a system of transportation/circulation necessary for organisms?

Why is a system of transportation/circulation necessary for organisms?

Ans: – The transportation or circulation is necessary for the organisms because of the oxygen transportation.

Which kind of blood vessels are responsible for the exchange of nutrients and respiratory gases between blood and tissues?

Ans: –The capillaries are responsible for the exchange of nutrients and respiratory gases between the bloods and tissue.

What is so special about heart that it continues beating without getting fatigued?

Ans: – As valves prevent themixing of oxygenated blood withthe carbon dioxide laden blood the heart is continues beating without fatigue.

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