2. Women have greater constitutional vitality because they normally outlive men their same age by at least three to four years in the United States.
3. The sexes differ in their basal metabolism – that of women being lower than that of men.
4. Men and women differ in skeletal structure. Women have a shorter head, broader face, less protruding chin, shorter legs and a longer trunk. And for what it is worth, the first finger of a women’s hand is usually longer than the third finger. With men the reverse is true. And boy’s teeth seem to last longer than do those of girls.
5. Women have larger stomachs, kidneys and livers but smaller lungs.
6. A woman’s thyroid is larger and more active. It enlarges during pregnancy and also during menstruation. It makes her more prone to goiter, provides resistance to cold, is associated with smooth skin, and a relatively hairless body. There is also a thin layer of subcutaneous fat that is an important element in personal beauty. The active thyroid also, according to Popeoe, may be a contributing factor why most women laugh and cry more easily than do men.
7. Women’s blood contains more water and 20 percent fewer red cells. Since these supply oxygen to the blood cells, she is more prone to faint.
8. With a differing muscular structure, men and women differ in sheer strength. Men are 50 percent stronger than women.
9. A woman’s heart beats more rapidly than does a man. (Eighty beats per minute for women: 72 for men). And her blood pressure is 10 points lower than her male counterpart and varies from minute to minute. But she has much less tendency to high blood pressure – at least until after menopause.
10. And finally, (Are you reading this, Susan?) women tolerate higher temperatures better, and consequently lower temperatures worse, than do men because of metabolic differences.