1 5 individual human development during youth physical n.
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1.5 Individual human development during youth: Physical. Physical Development. Primary and Secondary Sex Characteristics. Primary sex characteristics are those change that are directly involved in REPRODUCTION – these will involve enlargement of sex organs eg : penis and vagina

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primary and secondary sex characteristics
Primary and Secondary Sex Characteristics
  • Primary sex characteristics are those change that are directly involved in REPRODUCTION – these will involve enlargement of sex organs eg: penis and vagina
  • Secondary sex characteristics are not directly required for reproduction. So they will involve all the other changes that occur during puberty eg: widening of shoulders, pubic hair, oily skin, breast development.
primary secondary sex characteristics
Primary & Secondary sex characteristics

MALES

Primary sex characteristics

Growth of scrotum & testes

Secretion of hormones related to sperm production

Growth of penis

2ndry sex characteristics

Body & facial hair

More muscle mass

Greater height than females

Broadening shoulders

FEMALES

Primary sex characteristics

Increase in size of vagina & uterus

Ovaries produce hormones to start the menstrual cycle

Secondary sex characteristics

Hips widen

Development of breasts

Distribution of fat to hips

Body gets curvier

  • SIMILARITIES
  • Pubic hair
  • Oily skin
  • Voice deepens
  • Acne
  • Increase in height
  • Increase in body odour
hormone actions on the female body
Hormone actions on the female body
  • For females:
  • For males:

GnRH is released from the brain

FSH and LH are released from the pituitary gland (brain)

Oestrogen is released from the ovaries which results in female characteristics developing

LH and FSH act on the ovaries

hormone actions on the male body
Hormone actions on the male body

GnRH is released from the brain

FSH and LH are released from the pituitary gland (brain)

Testosterone is released from the testes which results in the male characteristics developing

LH and FSH act on the testes