Small spaces in the skull that regulate temperature and humidity of air are called?

The correct answer is sinuses. Sinuses are hollow spaces within the bones of the skull that are connected to the nasal cavity. They play several important roles, including the regulation of temperature and humidity of the air we breathe. As air passes through the sinuses, it becomes warmed and moistened before reaching the lungs, which is crucial for efficient respiratory function and protecting the delicate tissues of the respiratory tract.

In addition to regulating air quality, the sinuses help lighten the weight of the skull and contribute to vocal resonance. Their anatomical positioning around the nasal cavity also aids in the drainage of mucus, which is important for maintaining clear airways. This understanding of the function of sinuses is a fundamental aspect of anatomy and physiology relevant to nursing and healthcare.