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This “clock” is made up of about 20,000 neurons in the hypothalamus, the area near the center of the brain that coordinates your body’s unconscious functions, like breathing and blood pressure. Humans aren’t the only beings that have an internal clock system: All vertebrates – or mammals, birds, reptiles, amphibians and fish – have biological clocks, as do plants, fungi and bacteria. Biological clocks are why cats are most active at dawn and dusk, and why flowers bloom at certain times of day.
— Read on theconversation.com/your-body-has-an-internal-clock-that-dictates-when-you-eat-sleep-and-might-have-a-heart-attack-all-based-on-time-of-day-178601