Human Reproduction -...
Transcript of Human Reproduction -...
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Human Reproduction
Science/Health
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Male Reproductive System
• Testes
– Produce sperm (male gametes) by meiosis and release hormones
(Testes)
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• Scrotum
– Protects the testes, maintaining them at a cooler temperature than the body core
Male Reproductive System
Scrotum
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• Vas deferens
– Muscular tubes in which sperm mix with fluids to form semen as the sperm are moved from the testes to the urethra
– Can house the sperm for several months
Male Reproductive System
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• Urethra
– Opening through which sperm leave the body
Male Reproductive System
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• Penis
– Contains the urethra for the delivery of sperm
Male Reproductive System
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Female Reproductive System
• Ovaries
– Produce eggs (female gametes) by meiosis and release hormones
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• Oviducts / fallopian tubes
– Location of fertilization
– Connect the ovaries to the uterus (although the oviducts are not physically connected to the ovaries)
Female Reproductive System
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• Uterus
– Protects and nourishes the zygote during development
– Connects the oviducts to the cervix
Female Reproductive System
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• Cervix
– Sperm travel through this opening on the way to the uterus
– Dilates (opens) to allow the baby to leave the body during childbirth
Female Reproductive System
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• Vagina
– Sperm are deposited here, their first stop on the way to the egg.
– Opening through which the baby leaves the body, or through which unfertilized eggs leave the body
Female Reproductive System
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Stages of Embryonic and Fetal Development
• Indicate the correct order of changes which occur during each of the 9 months it takes for an embryo and fetus to develop.
• Write a number from 1 to 9 in the boxes given to match the month of development with the description of growth
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Stages in Human Development
• Fertilization
• First Trimester (weeks 1-12)
• Second Trimester (weeks 13-24)
• Third Trimester (weeks 25-38)
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Fertilization
• Occurs in the fallopian tubes
• Egg and sperm unite to form a zygote
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First Trimester • All organ systems begin to develop.
• Zygote is called an embryo
• Placenta and amniotic sac form
• At 8 weeks, the embryo is now called a fetus
• All major organs are formed
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• Rapid growth
• Skeleton forms
• Mother will feel movement by 20 weeks.
• Growth slows between 20 and 24 weeks.
Second Trimester
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Third Trimester • Growth in preparation for birth; significant
development in the brain.
• Immune system develops
• Fat is deposited under the skin.
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Visible Signs of Pregnancy
Not all women will experience all signs
(see pg 200 for complete list)
and
experiencing the signs doesn’t necessarily mean you’re pregnant!!
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Visible Signs of Pregnancy
• The woman will stop menstruating (often first sign!)
• Easily exhausted or dizzy
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Visible Signs of Pregnancy
• Hips will become slightly larger to support fetus and prepare for birth
• Her breasts will become larger to prepare to produce milk
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Visible Signs of Pregnancy
• Feeling of nausea or craving certain foods
• Gain weight (11kg on average)