Page 454 - Primary Six Notes

Primary sex characteristics in girls

 Uterus walls thicken

 Menstruation begins

 Ovaries develop and start releasing eggs (ovulation starts)

Secondary sex characteristics (physical)

These involve the physical development of the body parts.

Secondary sex characteristics in boys

 Voice breaks and deepens

 Hair grows on different parts of the body e.g. penis, armpits,

chest, around the mouth and anus.

 Bones and muscles enlarge i.e. a boy becomes muscular.

 Sweat glands become more active.

Secondary sex characteristics in girls

 Breasts enlarge and look tender and attractive

 Sweat glands become active making the face look smooth

 The hip (pelvis) enlarge and a girl puts on a lot of weight