Tum derive kar sakte ho ki cancer kyun hota hai — pehle yeh derive karke ki normal cells divide karna kyun band kar dete hain.
Step 1 — Ek cell ko divide karne ki wajah chahiye.Kyun? DNA ko copy karna aur split karna bahut zyada energy leta hai aur copy errors ka risk hota hai. Isliye evolution ne cells ko aisa banaya ki woh sirf tabhi divide karein jab signal mile (jaise badhne ke liye, ya dead cells ko replace karne ke liye).
Step 2 — Checkpoints hone chahiye.Kyun? Agar ek cell damaged DNA ke saath divide ho jaaye, toh daughter cells mein woh damage aa jaayega. Isliye cell cycle mein checkpoints hote hain jo poochte hain: Kya DNA intact hai? Kya cell kaafi bada hai? Kya chromosomes sahi se copy hue? Agar "nahi" → ruko / repair karo / khud ko destroy karo.
Step 3 — Self-destruct exist karta hai (apoptosis).Kyun? Agar damage repair nahi ho sakta, toh sabse safe move yeh hai ki cell khud ko maar le. Isse apoptosis kehte hain (programmed cell death).
Step 4 — Ab isse toodo.
Agar genes jo Steps 1–3 chalate hain woh mutate ho jaayein, toh cell:
Tumour kya hota hai? → uncontrolled division se bane abnormal cells ki ek mass.
Benign vs malignant? → benign apni jagah rehta hai; malignant invade karta hai aur spread karta hai (metastasis).
"Accelerator" aur "brake" genes ke naam batao. → proto-oncogenes (→oncogenes) aur tumour suppressor genes (jaise p53).
Age se risk kyun badhta hai? → mutations accumulate hote hain; kai mutations ki zaroorat hoti hai.
Recall Feynman: ek 12-saal ke bachche ko explain karo
Socho tumhara body chhote LEGO-building robots se bana hai. Normally ek robot tabhi apni nayi copy banata hai jab "abhi banao" wali light green ho, aur "stop" light pe ruk jaata hai. Cancer tab hota hai jab ek robot ki lights damage (dhoop se jalane, smoke, ya bas bad luck se) ki wajah se toot jaati hain, aur woh hamesha ke liye apni copies banata rehta hai. Robots ki yeh badhti hui bekar dheri tumour hai. Agar kuch toot hue robots kahin aur jaake nayi dheris shuru kar dein, woh sabse khatarnak type hai — aur isliye doctors isko jaldi pakadne ki koshish karte hain.
