ntr315 - precon - Preconception 1 Menstrual cycle phases...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Preconception 1. Menstrual cycle – phases and hormones produced in brain and in reproductive system 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 (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 2. Reproductive system of males - hormones produced in brain and in reproductive system Males: Hormones Produced in Brain and Reproductive System M Fluctuating levels of GnRH(hypothalmus) signal release of FSH(pituitary gland) and LH(pituitary gland) which trigger the production of testosterone (testes). Testosterone and other androgens stimulate maturation of sperm-takes about 70-80 days then transported to epididymus(tissue above testes). Upon ejaculation, sperm mix with secretion from testes, seminal vesicle,prostate,and bulbourethral gland to form semen. 3. Factors that negatively affect fertility in males. -Under nourished: Calorie deprivation and being underweight which causes them to have low fat stores CAUSING INFERTILITY
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
-Over nourished: High fat stores/ fat distribution and having central obesity. Being over nourished (obese) can cause an increase in fat cells around the testes which increases the heat in testes à destroying sperm -If men have inadequate levels of zinc it can cause a decrease in sperm production and decrease in testosterone. And if they have an Inadequate level of antioxidants they are susceptible to oxidation which could damage sperm. -High levels of Alcohol have a toxic affect on infertility -High levels of physical activity increases heat in testes destroying sperm. -Being obese and having excess body fat cells causes you to have more enzymes that can convert
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 8

ntr315 - precon - Preconception 1 Menstrual cycle phases...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online