Head contains genetic information and enzyme to help penetrate the egg cell membrane. Middle section packed with mitochondria for energy. Glagellum moves sperm to egg
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Describe the ovum cell
Much larger than sperm. Chemical around the outside to make impenetrable once sperm cell entered. Contains cytoplasm to support cell division
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What is sexual immaturity and puberty
Not being able to reproduce. During their teens, changes happen to boys and girls that lead to sexual maturity
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What happens during sexual maturity
Egg and sperm cells mature and bodies of both sexes adapt to allow reproduction to take place
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What is the influence of hormones for males
FSH stimulates sperm production. LH instructs the testes to secrete the male sex hormone testosterone. Testosterone controls the male secondary sexual characteristics
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What is the influence of hormones for females
Both FSH and LH are responsible for controlling the release of the female sex hormone oestrogen
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Male changes at puberty
Sperm production starts. Growth and development of male sexual organs, armpit/pubic/chest/facial hair. Increase in body mass and voice breaks
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Female changes at puberty
Menstrual cycle begins, and eggs are released by the ovaries every month. Growth and development of female sex organs, armpit/pubic hair. Increase in body mass. Voice deepens. Breasts develop
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What are adolescence and puberty definition
A time when physical and emotional changes happen. First part of adolescence when most of the physical changes take place
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The day pattern of the menstrual cycle
1-5 Menstruation: bleeding as uterus lining is shed. 6-13 New uterus lining forms. 14 Ovulation: Egg released by the ovary 15-19 Egg in Oviduct 15 28 blood supply develops in the new uterus lining
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What does progesterone do during the cycle
Produced by the corpus luteum. Maintains the lining of the uterus in order for it to receive a fertilised egg. Stops FSH and LH. If fertilised progesterone continues but if not it doesn't.
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Four stages of sexual reproduction
Gametes are produced. Male gamete is transferred to the female gamete- Fertilisation must occur, the sperm fuses with egg. Zygote formed develops into a new individual.
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What does the placenta do
Allows the embryo to obtain materials like oxygen and nutrients from the mother's blood. And allows it get rid of waste products. Secretes progesterone
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