UNIT TEST SOLUTIONS(BIOLOGY)

Q-1-How Does Oxygen And Carbon-Dioxide Enters In Our Body?

Ans-1-Oxygen And Carbon-Dioxide Enters In Our Body By Blood. Oxygen Is Carried By Red Blood Cells.Many Other Substanses Like Salt Are Also Transported By Blood.

Q-2- Differentiate Between Arteries And Viens.

Ans-2- Arteries -Arteries Carry Blood Away From The Heart

Arteries Have Thick Walls

Arteries do not Have Valves

Veins- Veins Carry Blood Towards The Heart.

Veins Have Thin Walls

Veins Have Valves.