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.
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
Women have smaller feet than men due to the fact that, in general, women have smaller joints and bones than their male counterparts. Based on this information, it is no surprise that women also have smaller ankles, knees, wrists and other major joints, explains The Register.Full Answer >
The average liver size is 7 centimeters for women and 10 1/2 centimeters for men. Liver size increases with age and depends on sex, body size and shape. A women’s liver averages 2 to 3 pounds and a man’s liver averages 3 pounds.Full Answer >
The average shoe size for men in the United States is a size 9, and the average for women is a size 7. Shoe sizes vary slightly from country to country.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 >