👉 Metameres are a type of structure found in some animals that help them to regulate their body temperature. They are made up of two parts, a larger part called an alveolar cavity and a smaller part called a capillary chamber. The alveolar cavity is filled with air, while the capillary chamber contains water vapor that rises into the alveolar cavity. This allows animals like fish to regulate their body temperature by adjusting the amount of oxygen they breathe in or out.
