ntr315 - exam1 google doc

ntr315 - exam1 google doc - Preconception-25-30 chance that...

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Preconception -25-30% chance that you will get pregnant having unprotected sex -Fertility- ability to produce -Infertility- inability to produce Reproduction Female -Oocytes- immature eggs in a baby 1,000,000 eggs last throughout her childbearing years puberty -as she grows she goes through puberty 3-5 years average starts at 12, the system becomes more complex, by that time you have about ½ a million left -atresia- eggs disenigrate (die off) Adulthood -ovulate- produce a mature egg 400-500 times (ovulation) produce a mature egg during child bearing years -menopause- age 50-52 lose all your eggs and is no longer able to conceive Male -when born they don’t have the ability to produce sperm -start producing sperm during puberty -can produce sperm their whole lives -sperm and fertiliy decrease as your age increases Hormones of Reproduction Brain Hypothalamusà Gonadotropin Releasing Hormone (GNRH) à PituitaryàFollicle Stimulating (FSH-Uterus) à Luteinizing Hormone (LH- Male Reproductive Organs) -Pituitary gland makes a lot of hormones -the egg (ovum) is mature and released ovary/testicles travels to the organs -LH and FSH- are produced in the pituitary until this point where hormones are exactly the same Reproductive Hormones in Females -FSH and LH act on ovary to produce estrogen and progesterone -egg and support cells produce estrogen and progesterone -estrogen- matures the egg that’s to be released and prepares the uterus for pregnancy and implantation (it thickens) -progesterone- helps thicken the lining of the uterus to help prepare for egg implantation as well **THIS MAKES FERTILIZATION POSSIBLE Menstrual Cycle- lasts 28 days -1. Follicular Phase- follicles are support cells surrounding immature eggs, nourishes egg and produces hormones à 1 egg matures and is released (ovulation) into the fallopian tube toward the uterus
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(uterus has thickened) -Luteal Phase- when uterusis thickening after ovulation if no pregnancy the uterus slops off à if not fertilized then the thickened uterus slops off the built up blood and nutrients (Menstrual period) **HAPPENING IN OVARY** -6-20 eggs mature at the surface but theres only 1 egg that reaches maturity à 1 egg and 1 follicle/ month - the follicle remains when egg starts to travel and remains producing hormones and becomes (Corpus luteum) during the luteal phase Different Stages Produce Different Hormones 12-14 days -GnRH stimulates -In the brain FSH increases and travels to ovary and acts on remaining follicle which produves estrogen enabling increasing levels triggering brain to secrete increasing LH triggers ovulation in the brain and increases FSH -then FSH and LH decrease and the follicle becomes corpus leuteum and pumps out hormones, mainly progesterone and some estrogen -estrogen begà progesteroneà end of 2nd half thickens uterus -Hypothalamus, pituitary, and uterus produce hormones -if egg isn’t fertilized the same thing repeats monthly HEALTH.HOWSTUFFWORKS.COM à Sexual Things Menstrual cycle- endometrium -endometrium- uterine lining
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ntr315 - exam1 google doc - Preconception-25-30 chance that...

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