How might large and complex nasal cavities conserve water during exhalation?
Large nasal cavities that are very complex have convolutions. These convolutions help to keep the moisture in when the animal exhales.
Many desert mammals have extremely convoluted nasal cavities. How might these large and complex nasal cavities conserve water during exhalation?
Moisture facilitates the diffusion of gases through the epithelial lining of the alveoli in the lungs. Mammals have convoluted turbinate bones in the nose - especially desert mammals. This allows moisture in the exhaled air to come in contact with cooler membranes before leaving the nares - so the water in the air condenses on the membranes and can be retained. So dry air comes in, gets moist, gas exchange occurs, and then the moisture…