Guess what: where gray hair usually starts to turn gray
A. Hair roots
B. Hair ends
Correct answer: Hair root
Answer Analysis:
Gray hair usually begins on the top of the head and on the temples, which is related to the activity and number of melanocytes in the hair follicles. As we age, the number of melanocytes in the hair follicle, which is responsible for synthesizing melanin, decreases and their activity decreases, resulting in lighter hair and eventually whiter.
Hair follicles on the crown of the head and temples often experience a decrease in melanocytes and reduced activity earlier than other areas, so these areas tend to be the first to grow gray hairs. This may be related to the characteristics of the hair follicles in these areas, the blood supply, and the environmental factors in which they are exposed.
In addition to age factors, genetics, stress, malnutrition, autoimmune diseases, etc., can also contribute to the appearance of gray hair. Some people may start to gray from the roots, while others may start from the ends, depending on the individual's physiology.
In conclusion, the appearance of gray hair is a gradual process, usually starting with the crown of the head and temples and gradually spreading to other areas. Maintaining a healthy lifestyle, such as a balanced diet, moderate exercise, and reducing stress, can delay the appearance of gray hair to a certain extent. But gray hair is still an inevitable natural phenomenon in the end, and we should accept it with a peaceful mind.