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Flash cards every weekday: https://www.instagram.com/igcsebioflashcards The alveoli (“many alveoli”, “one alveolus”) are the sites of gas exchange in the lungs. They are tiny air sacks sometimes described as being cauliflower-shaped….

Flash cards every weekday: https://www.instagram.com/igcsebioflashcards The alveoli (“many alveoli”, “one alveolus”) are the sites of gas exchange in the lungs. They are tiny air sacks sometimes described as being cauliflower-shaped….