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Gender roles are culturally influenced stereotypes which create expectations for appropriate behavior for males and females. [1] [2] [3] An understanding of these roles is evident in children as young as age four. [4] Children between 3 and 6 months can form distinctions between male and female faces. [5]
Sex differences in human physiology are distinctions of physiological characteristics associated with either male or female humans. These differences are caused by the effects of the different sex chromosome complement in males and females, and differential exposure to gonadal sex hormones during development.
In both males and females, the sex organs consist of two structures: the internal genitalia and the external genitalia. In males, the gonads are the testicles and in females, they are the ovaries . These are the organs that produce gametes (egg and sperm), the reproductive cells that will eventually meet to form the fertilized egg ( zygote ).
[citation needed] Overall, male secondary sex characteristics include: Growth of body hair, including underarm, abdominal, chest, and pubic hair. [4] [1] Growth of facial hair. [1] Enlargement of the larynx (Adam's apple) and deepening of the voice. [1] [24] Increased stature; adult males are taller than adult females, on average. [1]
Male primary sex characteristics are the penis, the scrotum and the ability to ejaculate when matured. Female primary sex characteristics are the vulva, vagina, uterus, fallopian tubes, cervix, and the ability to give birth and menstruate when matured. [1] Hormones that express sexual differentiation in humans include: estrogens such as estradiol
Emotional expression, understanding, and behavior appears to vary between males and females. A 2012 review concluded that males and females have differences in the processing of emotions. Males tend to have stronger reactions to threatening stimuli and that males react with more physical violence. [28]
Sexual differentiation is the process of development of the sex differences between males and females from an undifferentiated zygote. [1] [2] Sex determination is often distinct from sex differentiation; sex determination is the designation for the development stage towards either male or female, while sex differentiation is the pathway towards the development of the phenotype.
In order for human reproduction to be achieved, an individual must have undergone puberty first, requiring ovulation in females and the spermarche in males to have occurred prior to engaging in sexual intercourse or achieving pregnancy through non-penetrative means.
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