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First Five Name two parts of the plant male reproductive structure. What does the pistil consists of? What does the fruit represent? After male pollination, how does the male gamete reach the ovule?

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Announcements Cumulative Biology Exam Start Studying! Turn in past work!! Grades currently updated

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Human Reproduction

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Think About it- Human Reproduction What was needed to create you? Where are such cells produced? How does the fetus develop?

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Sexual Reproduction in Humans: Three Stages production of gametes eggs in females sperm in males gametes are haploid: have a single set of chromosomes (DNA) fertilization joining of gametes fusing of the nuclei of the gametes zygote the new, fused cell diploid: has pairs of chromosomes (DNA)

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Test What You Know In your current seating arrangement groups, match the scientific vocab to the correct arrow. Do NOT copy to your predictions to your own image sheet. Wait to check if your prediction is right. You will have 5 minutes to make you predictions

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Male Reproductive System Sperm Duct Scrotum

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Male Reproductive System testes located inside scrotum production of sperm (male gametes) production of male hormones scrotum sacs of skin where testes are located keep testes from getting overheated sperm ducts carry sperm from testes, through glands, to urethra

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Male Reproductive System prostate gland production and secretion of nutrient-rich fluid fluid joins with sperm to form semen urethra tube inside penis that moves either urine or semen penis excretion of urine movement of semen

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Female Reproductive System

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Ovaries production of eggs (female gametes) Oviducts also called Fallopian tubes lead from ovaries to uterus not directly connected to ovaries

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Female Reproductive System Uterus thick-walled muscular bag with soft lining location of baby development Cervix narrow opening of uterus Vagina muscular tube leading from cervix to outside of womans body

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Male & Female Gametes Eggs: relatively large do not move much begin to develop before birth at birth, a girl has thousands of immature eggs

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Male & Female Gametes Sperm: relatively small actively move produced from puberty on

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Fertilization

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M ENSTRUAL C YCLE

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Menstrual Cycle Beginning at puberty Immature eggs mature inside the ovaries Once mature, an egg will be released from the ovary Usually only one mature egg is released per month

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Menstrual Cycle The full cycle is about 28 days long The cycle involves loss of the uterus lining Day 1 Beginning of bleeding re-growth of the uterus lining Day 5 Bleeding has usually stopped An egg begins to mature in the ovary maturation and release of an egg cell On day 14, the egg is released The egg travels through the oviduct Pregnancy, if the cell is fertilized Menstrual cycle stops during pregnancy Loss of the uterus lining, if the egg is not fertilized The cycle begins again

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From Fertilization to Zygote to Implantation

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Pathway for Fertilization

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Fertilization

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Path of Zygote

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Cleavage of Human Embryo

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From Fertilization to Implantation After fertilization, the embryo travels through the oviduct, into the uterus. The embryo will implant in the wall of the uterus.

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Implantation

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Implantation and After Two key events after implantation of the embryo in the uterine wall are: Differentiation of cells Development of the placenta and amnion

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Cellular Differentiation The changing of unspecialized embryonic cells into the specialized cells, tissues and organs of a multicellular animal

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Cellular Differentiation

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Development of Placenta and Amnion Placenta an organ made of tissues from both the mother and embryo Allows for exchange of both nutrients and waste between the mother and embryo Exchange happens through villi

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Placenta

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Villi finger-like projections that increase the surface area for absorption similar to the villi in the small intestine

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Blood Flow in the Placenta Oxygenated blood enters the placenta through the mothers artery. Oxygen and nutrients move freely in placenta and pass to the villi by diffusion Oxygen and nutrients are delivered to the baby through the umbilical vein Carbon dioxide and wastes are returned to the placenta by the umbilical arteries

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Development of Placenta and Amnion Amnion A strong membrane that surrounds the developing embryo/fetus Secretes amniotic fluid A fluid that helps support and protect the developing embryo/fetus Amnion

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Checkpoint In your notebooks Name the steps that lead up to implantation

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FROM IMPLANTATION TO BIRTH Lets see what you know In your current seating arrangement groups, match the scientific vocab to the correct arrow.