Portia, a minor character in The Hunger Games
Portia Copeland, a character in Carson McCullers novel The Heart Is a Lonely Hunter
Portia Blake, the lead character in the American radio and television soap opera Portia Faces Life
Portia, the name for the frequently changed spider protagonist in Children of Time (novel), a novel by Adrian Tchaikovsky
Portia, Doors mother in Neverwhere, a novel by Neil Gaiman

See also
Porch
Porcia (disambiguation)
Porsche (disambiguation)
IGF also circulates in the blood bound to a large protein whose production is also dependent on GH. GH release is dependent on normal thyroid hormone. During the sixth decade of life, GH decreases in production. Because growth hormone is pulsatile and peaks during sleep, serum IGF is used as an index of overall growth hormone secretion. The surge of androgens at puberty drives an accompanying surge in growth hormone. Age
A number of hormonal changes occur with aging:

Decrease in testosterone
Decrease in serum DHT and 5-alpha reductase
Decrease 3AAG, a peripheral marker of DHT metabolism
Increase in SHBG
Decrease in androgen receptors, 5-alpha reductase type I and II activity, and aromatase in the scalpThis decrease in androgens and androgen receptors, and the increase in SHBG are opposite the increase in androgenic alopecia with aging. This is not intuitive, as testosterone and its peripheral metabolite, DHT, accelerate hair loss, and SHBG is thought to be protective. The ratio of T/SHBG, DHT/SHBG decreases by as much as 80% by age 80, in numeric parallel to hair loss, and approximates the pharmacology of antiandrogens such as finasteride.Free testosterone decreases in men by age 80 to levels double that of a woman at age 20. About 30% of normal male testosterone level, the approximate level in females, is not enough to induce alopecia; 60%, closer to the amount found in elderly men, is sufficient. The testicular secretion of testosterone perhaps "sets the stage" for androgenic alopecia as a multifactorial diathesis stress model, related to hormonal predisposition, environment, and age.