1. Follicle Structure:
* The hair follicle: The follicle is a tiny pocket in the skin where each hair grows. It acts like a "root" for the hair, anchoring it to the scalp.
* The arrector pili muscle: This tiny muscle is attached to the follicle. When it contracts, it pulls the hair upright, causing "goosebumps."
2. Physical Properties of Hair:
* Hair shaft: The hair shaft is the visible part of the hair. Its shape, texture, and thickness contribute to how it lies.
* Cuticle: The outer layer of the hair shaft is made up of overlapping scales. These scales help to create friction and hold hair strands together, giving them volume and body.
* Hair density: The number of hairs per square inch on your scalp also impacts how your hair falls and how it can be styled.
3. External Factors:
* Gravity: Gravity plays a significant role in how hair falls and hangs.
* Styling products: Products like hairspray, gels, and mousse can help to hold hair in place.
* Hairstyles: Braids, buns, and other styles can help to secure hair.
* Environmental factors: Humidity, wind, and rain can affect hair's ability to stay put.
4. Hair Products:
* Hairspray: This product is designed to hold hair in place and add texture.
* Gel: Gel can help to create defined styles and hold hair in place.
* Mousse: Mousse can add volume and texture to hair, making it easier to style.
5. Natural Factors:
* Sebum: This natural oil produced by the scalp helps to lubricate hair and keep it healthy.
* Keratin: The protein that makes up hair gives it strength and structure.
It's a complex interplay of these factors that determines how your hair looks and behaves.