Koalas have a nervous system much like that of other mammals, other than having an exceptionally small brain.The respiratory system that a koala has is much like that of other mammals except that it lacks "swell bodies" which are glands that regulate air flow between the left and right nasal cavities.
Like most mammals, koalas have a four-chambered heart and have a closed circulatory system, meaning their blood flows through veins. Also, their normal resting heart rate is about 90 beats per minute.
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