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Why Do Some People Have Straight Hair and Others Have Curly Hair?

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Why Do Some People Have Straight Hair and Others Have Curly Hair?

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Whether your hair is curly or straight depends on the genes you inherit from your parents. Each hair on your scalp grows out of a tiny opening called a hair follicle. Different people inherit different-shaped follicles. Straight hairs grow from round follicles. Wavy hairs grow from oval follicles. And curly hairs grow from follicles that are flattened in shape. It’s sort of like squishing dough through a cookie press. Different-shaped holes in the tip of the press make different-shaped cookies. The chemistry of your hair also determines how curly it is. Hair is made mainly of a protein called keratin. (That’s the same tough stuff found in fingernails, horns, and feathers.) Sulfur atoms in keratin attract each other and bond together, causing the hair to bend. The more sulfur bonds in your hair, the curlier it is. People straighten curly hair or “perm” straight hair by applying chemicals to change the number of sulfur bonds in their hair protein. But hair keeps growing and you can’t per

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Every hair on your head or on your body is made up of a root, the soft, bulb-shaped section under your skin, and the shaft, the longer strand that sticks out of your skin. If you were to cut a shaft of your hair from near the root and look at a cross-section of it under a microscope, it would have either of two shapes: round or

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One of the best questions ever asked on yahoo.. Very interesting question !!! Every hair on your head or on your body is made up of a root, the soft, bulb-shaped section under your skin, and the shaft, the longer strand that sticks out of your skin. If you were to cut a shaft of your hair from near the root and look at a cross-section of it under a microscope, it would have either of two shapes: round or flat. If it appears round, that means your hair will grow out straight; if that cross-section appears flat, that means your hair will grow at different rates in different places, making it curl or wave. The flatter the shaft, the curlier it will be. The shape of your hair shafts is determined by the shape of your parents’ hair shafts, for this is one of the characteristics you inherited from them.

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