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Powerpointhumanreproduction 130505180857-phpapp02
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HUMAN REPRODUCTION Sexual reproduction is the process involving the fusion of haploid nuclei to form a diploid zygote and the production of genetically dissimilar offspring
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The reproductive system or genital system is a system of organs within an organism which work together for the purpose of reproduction. Many non-living substances such as fluids, hormones, and pheromones are also important accessories to the reproductive system. Unlike most organ systems, the sexes of differentiated species often have significant differences. These differences allow for a combination of genetic material between two individuals, which allows for the possibility of greater genetic fitness of the offspring. my slides educates more about the human reproduction
Transcript of Powerpointhumanreproduction 130505180857-phpapp02
HUMAN REPRODUCTION
Sexual reproduction is the processinvolving the fusion of haploid nuclei to form adiploid zygote and the production of genetically
dissimilar offspring
MALE REPRODUCTIVE SYSTEM
HORMONES: male
• Testosterone (testes)• Development of male sexual secondary
characteristics: - Penis and testes grow: produce sperm and
testosterone - Facial hair develops - Changes to larynx: deeper voice - Hair grows on chest and in armpits - Pubic hair develops
FEMALE REPRODUCTIVE SYSTEM
FEMALE REPRODUCTIVE SYSTEM
HORMONES: female
• Oestrogen and progesterone• Development of male sexual secondary characteristics: - Ovaries grow- eggs develop and female hormones are
released - Hair grows in armpits - Brests develop/increase in size - Hips broaden - Pubic hair grows - Vagina enlargens
Female hormones
OVARIES
MENSTRUAL CYCLE
Fertilisation: the joining of the nuclei of the male gamete (sperm) and the female gamete (egg)
Ovulation and implantation
PLACENTA
BIRTH
• It begins when the strong muscles in the wall of the uterus start to contract. This is called labour.
• The wall of the cervix, gradually becomes wide enough for the baby to be pushed through.
• The wall of the vagina can stretch to allow the baby to be pushed through.
Birth
Afterbirth The placenta falls away from the wall of the uterus, and passes out through the vagina.
ANTE-NATAL CARE• Diet plenty of calcium: why?• Diet plenty of extra iron: why?• Diet with extra carbohydrates: why?• Diet with extra protein: why?• Continue to take exercise• No smoking: why?• Not too much alcohol or drugs.• Avoid illnesses: rubella (deaf or other
disabilities)• AIDS: the virus HIV can cross the placenta
Breast feeding vs. Milk formula
Advantage of breast milk vs. Formula milk
• Free!• No need to use an equipment, which, unless clean it
´s easier for bacteria to get into the milk and make the baby ill.
• Contains antibodies from the mother, which helps the baby ti fight off infectious diseases.
• Close relationship to develop between mother and baby.
The composition changes as it grows so that´s exactly right for the different stages of development.
BIRTH CONTROL:methods
• NATURAL →abstinence
• CHEMICAL →contraceptive pill →spermicide• MECHANICAL →condom →diaphragm →IUD• SURGICAL → vasectomy → female sterilisation
References
• http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/S/Sexual_Reproduction.html
• http://www.biotopics.co.uk/human2/reprsy.html
