3 SCIENCE Chpt 12 Human reproduction 2

Puberty age range (female)

Between the ages of 10 and 16.

Uterus and vagina during puberty

Grow to adult size.

Body hair during puberty

Grows under arms and in the pubic area.

Pelvis and hips during puberty

Widen.

Breasts during puberty

Develop.

Menstrual cycle definition

Repeating sequence preparing the female body for potential pregnancy.

Start and end of menstruation

Starts at puberty and ends at menopause.

Average menstrual cycle length

28 days.

Menstrual cycle Days 1-5

Lining breaks down, causing menstruation (period).

Menstrual cycle Days 6-13

Blood vessels build up in the lining of the uterus.

Menstrual cycle Day 14

Ovulation: an egg is released from the ovary.

Menstrual cycle Days 15-26

Uterus lining continues to build up for potential zygote implantation.

Menstrual cycle Days 27-28

Lining breaks down if a zygote does not implant.

Fertile period days

Days 9-16, when pregnancy is most likely.

Egg survival time

Up to 2 days following ovulation.

Sperm survival time

Up to 5 days in the female body.