Final answer:
The diameter of the hair shaft is much larger in coarse hair compared to fine hair. Coarse hair strands are thicker than fine hair strands. The hair matrix, which contains a layer of basal cells, surrounds the hair follicle and is essential for hair growth.
Step-by-step explanation:
The cross-section, or diameter, of the hair shaft is much larger in coarse hair than in fine hair. When comparing different types of hair, coarse hair has a wider diameter than fine hair, which means the individual strands of coarse hair are thicker than those of fine hair.
Hair is a filament that grows from a hair follicle in the dermis of the skin. The hair shaft, a key part of the hair, has three zones: the outermost zone called the cuticle; the middle zone called the cortex, and the innermost zone called the medulla. The hair matrix contains a layer of basal cells and it surrounds the hair follicle, playing a crucial role in the growth of the hair shaft.