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LEFT CLICK OR PRESS SPACE BAR TO ADVANCE, PRESS P BUTTON TO GO BACK, PRESS ESC BUTTON TO END LEFT CLICK OR PRESS SPACE BAR TO ADVANCE, PRESS P BUTTON TO GO BACK, PRESS ESC BUTTON TO END COMPUTER PRESENTATIONS FOR KS3 SCIENCE - BIOLOGY ©2003, STEVE PARKER COMPUTER PRESENTATIONS FOR KS3 SCIENCE - BIOLOGY ©2003, STEVE PARKER

1 1 KS3 SCIENCE - BIOLOGY KS3 SCIENCE - BIOLOGY Human Reproduction Human Reproduction

GROWING UP 2 2

3 3 As you grow older, you eventually reach a stage called Puberty, also known as Adolescence As you grow older, you eventually reach a stage called Puberty, also known as Adolescence

GROWING UP 4 4 Puberty is when people begin to look more like adults - things appear called the Secondary Sexual Characteristics Puberty is when people begin to look more like adults - things appear called the Secondary Sexual Characteristics

GROWING UP 5 5 For example boys grow hair on the face and around the Genitals, and the voice deepens For example boys grow hair on the face and around the Genitals, and the voice deepens While girls grow hair under the arms and develop larger breasts While girls grow hair under the arms and develop larger breasts

GROWING UP 6 6 During puberty oil Glands in the skin often make more of an oily substance called Sebum During puberty oil Glands in the skin often make more of an oily substance called Sebum

GROWING UP 7 7 This sebum can block the Pores causing dreaded spots This sebum can block the Pores causing dreaded spots

GROWING UP 8 8 The uncertainty that teenagers feel, plus the increased Hormones can make them moody The uncertainty that teenagers feel, plus the increased Hormones can make them moody

THE REPRODUCTIVE SYSTEM 9 9

10 The Female System The Female System

THE REPRODUCTIVE SYSTEM 11 Fallopian Tube (Oviduct) Fallopian Tube (Oviduct) Cervix Vagina Ovary Uterus (Womb) The Female System

THE REPRODUCTIVE SYSTEM 12 The Female System Every 28 days or so, an Egg is released from one of the ovaries Every 28 days or so, an Egg is released from one of the ovaries

THE REPRODUCTIVE SYSTEM 13 The Female System If nothing else happens, the lining of the uterus breaks down, leading to Menstrual Bleeding (called a Period) If nothing else happens, the lining of the uterus breaks down, leading to Menstrual Bleeding (called a Period)

THE REPRODUCTIVE SYSTEM 14 The Male System The Male System

THE REPRODUCTIVE SYSTEM 15 The Male System Urethra Sperm Duct Testes Bladder Penis

THE REPRODUCTIVE SYSTEM 16 The Male System When a man is sexually aroused, blood rushes into the tissue in the penis and it becomes erect When a man is sexually aroused, blood rushes into the tissue in the penis and it becomes erect

THE REPRODUCTIVE SYSTEM 17 The Male System When the penis is inserted into the vagina, Sperm from the testes are ejaculated out of the penis in a liquid called Semen When the penis is inserted into the vagina, Sperm from the testes are ejaculated out of the penis in a liquid called Semen

THE REPRODUCTIVE SYSTEM 18 The Male System Sperm cells have tails which allow them to swim Sperm cells have tails which allow them to swim

THE REPRODUCTIVE SYSTEM 19 Egg released from the ovary travels down the fallopian tube Egg released from the ovary travels down the fallopian tube Sperm in the vagina swim into the uterus to meet the egg Sperm in the vagina swim into the uterus to meet the egg

THE REPRODUCTIVE SYSTEM 20 At Fertilisation Conception happens when a sperm fuses with the egg At Fertilisation Conception happens when a sperm fuses with the egg

HAVING A BABY 21

HAVING A BABY 22 Once the egg and sperm have fused to form a single Cell, this cell divides and then implants itself in the uterus Once the egg and sperm have fused to form a single Cell, this cell divides and then implants itself in the uterus

HAVING A BABY 23 The cells develop into an Embryo connected to the uterus by the Umbilical Cord, which carries food and oxygen from the Placenta The cells develop into an Embryo connected to the uterus by the Umbilical Cord, which carries food and oxygen from the Placenta

HAVING A BABY 24 After 40 weeks or 9 months, the baby is fully developed and the muscles in the uterus contract to push the baby out of the womb After 40 weeks or 9 months, the baby is fully developed and the muscles in the uterus contract to push the baby out of the womb