Video narration
Khoon poore sharir mein ghoomta kaise rehta hai? Ghar ki paani ki motor aur pipe yaad kijiye. Motor paani ko aage bhejti hai, aur pipe ka raasta use wapas laata hai. Sharir mein hriday ek pump hai. Lekin yahan ek mod hai: khoon keval hriday se sharir tak jaakar khatm nahin hota. Hriday use pehle phephdon tak bhejta hai. Phephdon mein khoon oxygen leta hai. Yeh oxygen wala khoon wapas hriday mein aata hai, aur wahan se sharir ki or rawana hota hai. Dhamaniyan ve raktvahiniyan hain jo khoon ko hriday se door le jaati hain. Ve ise sharir ki koshikaon tak pahunchati hain, taaki unhen oxygen mil sake. Iske baad shiraen khoon ko sharir se wapas hriday ki or laati hain. Hriday phir use phephdon tak bhej deta hai. To jawab hai: khoon ka raasta hai - hriday, phephde, phir hriday, sharir, aur wapas hriday. Yeh chakr rukta nahin.