1. Protection: Head hair acts as a natural insulator, helping to protect the scalp from the sun's harmful ultraviolet rays. It also provides a cushion against minor impacts and can help to keep the head warm in cold weather.
2. Sensory Perception: Hair follicles contain nerve endings that are sensitive to touch, allowing us to feel things that come in contact with our scalp. This is important for detecting potential dangers and also plays a role in social interactions.