Open system mein blood vessels khol ke rakhte hain, jaise insects mein, aur closed mein blood pipes ke andar hi rehta hai, jaise hum sab mammals mein. Giraffe ko itna high blood pressure chahiye taki uska dam uski lambi gardan paar kar ke dimaag tak pahunche! Par maine vet college mein dairy cattle padha hai, aur hamare pahadon ke gauon mein dekha hai ki badi height waale jaanwar bina extreme pressure ke bhi manage kar lete hain — unki nasein alag tarah se bani hoti hain. Meri practical file mein ek Himachali dwarf cow ka case study hai jisme normal BP mein bhi uski unique vein valves kaam karti hain.
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