English

Insaanon mein Shvasan

Class 7 Science · Chapter 9: Jaanwaron mein Jeevan Prakriyaayein · NCERT Curiosity section 9.2.1

Seekho

Khaane ke bina kuch samay aur paani ke bina ek-do din jee sakte, par saans ke bina bas kuch minute. Hawa nathunon se aati, jahaan baal aur shlesma dhool fasaate, shvaas nali se jaati, jo do phephdon mein bantti, aur laakhon chhoti vaayu-thailiyon, alveoli, mein khatam hoti. Pasliyon ka pinjra phephdon ko bachaata.

Meher model banaati: bottle jiska tal rubber sheet se dhaka, andar Y-nali par do gubbaare. Sheet neeche kheenchne par gubbaare phoolte; chhodne par pichakte. Shareer mein jab hum saans lete, pasliyan upar aur bahar jaati aur gumbad jaisa diaphragm neeche, hawa ko jagah milti. Saans chhodte samay pasliyan neeche-andar aur diaphragm upar, hawa bahar.

Straw se phookne par choone ka paani doodhiya, par saadhaaran hawa pump karne par nahi: chhodi hawa mein zyaada carbon dioxide. Li gayi hawa mein lagbhag 21% oxygen aur 0.04% CO₂; chhodi hawa mein lagbhag 16–17% oxygen aur 4–5% CO₂. Alveoli mein oxygen khoon mein jaati aur carbon dioxide bahar.

Khoon har koshika tak oxygen le jaata, jahaan wo glucose todkar oorja chhodti: ye rasaayanik prakriya shvasan hai. Saans lena (hawa andar-bahar) bhautik; shvasan rasaayanik. Hriday, khoon aur rakt vaahikaayein parisancharan tantra banaate jo oxygen aur poshak tatva le jaata. Smoking phephde kharaab karti, aur paroksh dhoomrapaan paas ke logon ko bhi nuksaan deta.

glucose + oxygen → carbon dioxide + water + energy

Explore: andar ya bahar?

  1. Har badlaav sort karo.

Yaad rakho

  • Hawa: nathune → shvaas nali → phephde → alveoli, jahaan oxygen khoon mein aur CO₂ bahar.
  • Saans bhautik; shvasan (glucose + oxygen → CO₂ + paani + oorja) rasaayanik.

Quick check

Saans lete samay diaphragm …

  1. moves down
  2. moves up
  3. stays still
  4. disappears
Answer

moves down. Isse chhaati mein jagah badhti aur hawa aati.

Socho

Daud ke baad tum tez aur gehri saans lete. Kyun?

Ek answer

Kaam karti maans-peshiyon ko zyaada oorja chahiye, to wo tez shvasan karti, zyaada oxygen chahiye aur zyaada carbon dioxide nikaalni padti.

Practice

Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.