which body system differentiates a male from a female
the external genitalia the sex hormones reproductive the type of gonads
title: Male reproductive system text: Male reproductive system The male reproductive system consists of a number of sex organs that play a role in the process of human reproduction. These organs are located on the outside of the body and within the pelvis. The main male sex organs are the penis and the testicles which produce semen and sperm, which, as part of sexual intercourse, fertilize an ovum in the female's body; the fertilized ovum (zygote) develops into a fetus, which is later born as an infant. The corresponding system in females is the female reproductive system. The penis is the male intromittent organ. It title: Quigley scale text: gender. In a 2015 issue paper on "Human rights and intersex people ", the Commissioner for Human Rights of the Council of Europe recommended a review of medical classification that pathologise variations in sex characteristics. Numerous clinical scales and measurement systems exist to define genitals as normal male or female, or "abnormal", including the orchidometer, Prader scale and the satirical Phall-O-Meter. Quigley scale The Quigley scale is a descriptive, visual system of phenotypic grading that uses seven classes between "fully masculinized" and "fully feminized" genitalia. It was proposed by pediatric endocrinologist Charmian A. Quigley et al. in 1995. It is title: Male reproductive system text: have the potential to become either testes or ovaries. Reproductive sex organs for both male and female are derived from the same embryonic tissues and are considered homologous tissues or organs. After the testes have differentiated, male sex hormones, called androgens, are secreted from interstitial cells (cells of Leydig). The major androgens secreted by these cells is testosterone and secretion begins 8 to 10 weeks after conception. Testosterone secretion reaches a peak at 12 to 14 weeks, and declines to very low levels by the end of the second trimester (about 21 weeks). Levels are the barely detectable 4–6 months title: Sex and gender distinction text: individual's sex influences his or her behavior. "Sex" is annotated as different from "gender" in the "Oxford English Dictionary", where it says "sex" "tends now to refer to biological differences". The World Health Organization (WHO) similarly states that "'sex' refers to the biological and physiological characteristics that define men and women" and that "'male' and 'female' are sex categories". The "American Heritage Dictionary" (5th ed.), however, lists "sex" as both "Either of the two divisions, designated female and male, by which most organisms are classified on the basis of their reproductive organs and functions" and "One's identity as either female title: Sexual differentiation text: Sexual differentiation Sexual differentiation is the process of development of the differences between males and females from an undifferentiated zygote. As male and female individuals develop from zygotes into fetuses, into infants, children, adolescents, and eventually into adults, sex and gender differences at many levels develop: genes, chromosomes, gonads, hormones, anatomy, and psyche. Sex differences range greatly and include physiologically differentiating. Sex-dichotomous differences are developments which are wholly characteristic of one sex only. Examples of sex-dichotomous differences include aspects of the sex-specific genital organs such as ovaries, a uterus or a phallic urethra. In contrast, sex-dimorphic differences are matters of