Open circulatory system mein blood directly tissues ke contact mein aata hai, jaise insects mein. Closed system mein blood vessels ke andar hi rehta hai, jaise hum humans aur giraffe mein 🏋️♂️. Giraffe ka heart itna strong blood pressure banata hai taani brain tak blood pahucha sake, unki lambi gardan ke liye. Actually, mujhe yeh giraffe wala point samajh aaya kyuki mere papa gym mein pressure machine check karte hai, unh bola high pressure se door dur tak pump hota hai, waise hi giraffe ka kaam hai! Lekin yaar, meri life mein dekha hai mere chacha ke poultry farm par, chickens ka open system hai par woh bhi fit rehte hai...toh maybe pressure ki zarurat sirf itni height ke liye hai, size ke liye nahi.
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