BiologyPushan · Class 9-10
Dil ka pump aur double circulation
Insaan ka khoon phephdon aur sharir dono taraf do baar guzarta hai — isse 'double circulation' kyun kehte hain?
Socho pehle… phir dekho jawab
Kyunki har cycle mein khoon dil se do baar guzarta hai: ek baar phephdon ki taraf (oxygen lene), aur ek baar sharir ki taraf (oxygen dene). Isse khoon poori taakat se aur saaf oxygen ke saath sharir tak pahunchta hai.
Mechanism: dil ke ek taraf se oxygen-kam khoon phephdon ko jaata hai, wahan usme oxygen milta hai. Yeh oxygen-bhara khoon wapas dil ki doosri taraf aata hai, jahan se woh poore sharir mein pump hota hai. Isliye do alag circuits — ek phephdon wala, ek sharir wala — inhe milaake 'double circulation' kehte hain.
Term: dil ek din mein lagbhag 1 lakh baar dhadakta hai. Valves (dwar jaise structures) dil ke andar khoon ko sirf ek disha mein jaane dete hain, taaki woh ulta na bahe.
So what: double circulation se saaf aur oxygen-kam khoon ka mix nahi hota, isliye humara sharir zyada tez aur efficient tarike se kaam kar paata hai.
Ghar pe try karo
Ek diagram banao: dil, phephde, aur sharir ke beech khoon ke do circuits (loops) teer (arrow) se dikhao. Rangon se oxygen-bhara aur oxygen-kam khoon alag dikhao.
Wow!
Ek machli ka dil sirf ek circuit chalata hai, par insaan ka dil do — isliye humara khoon zyada oxygen-bhara reh paata hai.
3 sawaal
- Double circulation mein kitne circuits hote hain?
Jawab dekho
Do. Ek phephdon ki taraf, ek sharir ki taraf — yeh do circuits milke double circulation banate hain.
- Valves ka kaam kya hai?
Jawab dekho
Khoon ko sirf ek disha mein bahne dena. Valves khoon ko ulta bahne se rokte hain.
- Dil roughly ek din mein kitni baar dhadakta hai?
Jawab dekho
1 lakh baar. Dil ek din mein lagbhag 1 lakh baar dhadakta hai.
NCERT se jodo: NCERT Class 10 Science — life processes (transportation, circulatory system)