BiologyKhaga · Class 6-8
Circulatory system: dil, naseein aur khoon ka network
Sharir ke har chhote se chhote hisse tak khaana aur oxygen kaise pahunchta hai?
Socho pehle… phir dekho jawab
Khoon ke through! Dil khoon ko pump karta hai, aur naseein ka ek bada network sharir ke har hisse tak khoon pahunchata hai — isse circulatory system kehte hain.
Dil ek muscle hai jo lagatar sikudta aur failta hai — isi se khoon dabaav ke saath aage badhta hai. Dil ke andar chaar chambers hote hain, taaki oxygen-bhara aur oxygen-kam khoon aapas mein mix na ho.
Do tarah ki naseein: kuch dil se khoon le jaati hain, kuch khoon dil tak wapas laati hain. Beech mein bahut chhoti-chhoti naseein hoti hain, jinse khoon aur cells ke beech khaana-oxygen ka lena-dena hota hai.
Yeh system kyun zaroori hai? Kyunki har cell ko oxygen aur khaana chahiye kaam karne ke liye, aur waste bahar nikalna hai — khoon dono kaam karta hai.
Ghar pe try karo
Apni kalai par pulse dhoondo aur 15 second gino, phir 4 se guna karo — yeh tumhari 1 minute ki heart rate hai. Ab 1 minute kudne ke baad dobara naapo aur compare karo.
Wow!
Tumhare sharir mein naseein ka poora network agar seedha kar do, toh woh hazaron kilometre lambi ban sakti hai!
3 sawaal
- Dil ke andar kitne chambers hote hain?
Jawab dekho
Chaar. Dil ke andar chaar chambers hote hain.
- Sabse chhoti naseein ka kaam kya hai?
Jawab dekho
Khoon aur cells ke beech lena-dena. Chhoti naseein (capillaries) mein khoon aur cells ke beech khaana-oxygen ka lena-dena hota hai.
- Dil ke chambers alag kyun rakhe gaye hain?
Jawab dekho
Taaki oxygen-bhara aur oxygen-kam khoon mix na ho. Alag chambers mixing rokte hain, taaki sharir ko sahi oxygen mile.
NCERT se jodo: NCERT Class 7 Science — transportation in animals and plants (circulatory system)