Rock the Colorado Cosmetology Written Exam 2026 – Beautify Your Career Today!

The correct answer is the papilla. The papilla is a small structure located at the base of the hair follicle and is essential for hair growth. It contains blood vessels that supply nutrients to the hair bulb, which in turn nurtures the hair follicles. If the papilla is damaged, it can significantly impede the ability of the hair to grow, as the necessary nutrients and oxygen may not reach the hair shaft.

The cortex, while crucial for giving hair its strength and texture, does not play a direct role in the initial growth process. The matrix cell is where new hair cells are generated and is vital for hair growth, but it relies on the papilla for sustenance. The medulla, which is the innermost layer of the hair, is often present in thick hair and has limited impact on the growth process itself. Highlighting the significance of the papilla emphasizes its role as a foundational support for hair growth.