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Cell Transport
Active vs passive transport
Membrane ke aar-paar cheezein le jaane ke do tareeke — ek ATP kharch karke upar dhakelta hai, doosra neeche muft me beh jaata hai.
Active transport
Energy-dependent movement concentration gradient ke KHILAAF, ATP se chalta hai (jaise sodium–potassium pump). Ek taraf substance jama kar sakta hai.
Passive transport
Gradient ke SAATH movement, bina energy ke — simple diffusion, carriers/channels se facilitated diffusion, aur paani ke liye osmosis.
Trap yeh hai
Faisla energy + direction se hota hai. Active = ATP, gradient ke khilaaf. Passive = no ATP, gradient ke saath. Facilitated diffusion protein use karta hai par phir bhi passive hai — carrier use karna energy kharch karna nahi hai.
Ek quick check
Facilitated diffusion passive kyun kehlata hai?
- AATP use karta hai
- BGradient ke khilaaf le jaata hai
- CKoi energy nahi kharch karta, bas gradient ke saath jaata hai
- DSirf paani le jaata hai