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Human hair contains melanin which provides dark coloration and protection from UV radiation. Human hair can absorb and emit light across a wide range of wavelengths. The image above depicts melanin autofluorescence at 365-400 nm excitation from a strand of dark brown human hair. A woman with dark blonde hair.
Nov 9, 2022 · Hair covers almost every surface of the human body. This article gives an overview of the structure of hair. It explains how it grows, what it’s made of, and how it changes.
Jan 11, 2023 · The two main types of hair are the shorter and thinner "vellus" hairs (peach fuzz) found on the body and the longer and thicker "terminal" hairs. Examples of terminal hairs include the hair on your head, facial hair, eyelashes, eyebrows, pubic hair, chest hair and belly hair.
Feb 13, 2019 · Hair follicles are responsible for your hair color, hair growth, hair texture, and more. These follicles have three phases of growth, and consistently produce hair throughout your life.
The growth of human hair occurs everywhere on the body except for the soles of the feet, the palms of the hands, the inside of the mouth, the lips, the backs of the ears, some external genital areas, the navel, and, apart from eyelashes, the eyelids.
Oct 14, 2014 · The adult human hair is around 20–180 µm in width, and generally grows to a length of approximately 90 cm. It consists of many layers including the cuticle, the cortex and the medulla. These layers are bound together by the cell membrane complex ( Robbins, 2012 ).
Sep 3, 2019 · In the last century, human scalp hair morphology has been studied from multiple, and sometimes mutually exclusive, perspectives by anthropologists, biologists, geneticists, forensic scientists, and cosmetic scientists.
May 16, 2024 · hair, in mammals, the characteristic threadlike outgrowths of the outer layer of the skin (epidermis) that form an animal’s coat, or pelage. Hair is present in differing degrees on all mammals. On adult whales, elephants, sirenians, and rhinoceroses body hair is limited to scattered bristles.
Aug 14, 2023 · In humans, hair is thinner and lighter than in primates. Human hair aids in sweating thermoregulation and serves as a sense organ. Hair also protects from the elements, including UV radiation. Additionally, humans have specialized hair, such as eyelash hair and eyebrow hair.
Explain variation in human hair colour. What factors determine the texture of hair? Describe two functions of human hair. What hypotheses have been proposed for the loss of body hair during human evolution? Discuss the social and cultural significance of human hair. Describe one way in which hair can be used as a method of communication in humans.
