Men are more likely than women to lose their hair because changes in testosterone levels are a major cause of hair loss. Women have less testosterone, so they tend to keep their hair, although it may thin a bit during menopause.Know More
Natural hair loss, called androgen alopecia, occurs when an enzyme converts testosterone into dihydrotestosterone. Dihydrotestosterone causes hair to become thin and brittle, leading to permanent hair loss. Higher amounts of this hormone build up as men age, leading to progressive baldness. Some men appear to be genetically predisposed to hormonal changes earlier in life or more quickly. Researchers theorize that Asian men may have less dihdrotestosterone than Caucasian ones, because the former tend not to exhibit the same likelihood of baldness.
Women may notice hair thinning during menopause because their bodies begin to produce less estrogen, which increases the influence of testosterone on their hair. However, the lesser levels of testosterone lead to a more even thinning in most women rather than the typical male pattern baldness.
Some animals display similar patterns of baldness. Male chimpanzees sometimes lose the hair on their heads as they age. Stump-tailed macaques, a species of monkey found in southeast Asia, are unusual because both sexes lose the hair on their faces and heads.Learn more about Human Anatomy
According to Calm Clinic, a heart beating over 106 beats per minute is likely to cause anxiety and potentially tachycardia. The normal resting heart rate for an adult is between 60 and 100 beats per minute. A heart rate any greater than this is likely to result in serious health problems. Tachycardia is a common diagnosis for a high heart rate, but there are usually other symptoms that accompany it.Full Answer >
Falling asleep while reading is most likely the result of being in a relaxed state. If an individual frequently falls asleep during activities other than reading, a sleep disorder may be a possible cause.Full Answer >
Early adulthood, a period typically defined as being between the ages of 25 and 40, brings with it a whole host of physical changes, including changes in the reproductive system, skin, hearing and vision, according to Boundless. As the body ages during this period, immune function is also decreased, giving way to sickness and disease in some individuals.Full Answer >
Both men and women have mammary glands, but these milk-producing glands are undeveloped and typically nonfunctional in males. The release of estrogen after puberty prompts the development of the glandular tissue in women.Full Answer >