 | How the Body Works : The Menstrual Cycle How the Body Works The Menstrual Cycle Controlled by hormones, the average menstrual cycle is twenty-eight days. From about day 5 pituitary follicle-stimulating hormone, or FSH, promotes the growth of a follicle in the ovary. Follicular cells produce estrogen, which builds up the endometrium, the uterine lining, in readiness for implantation of the fertilized egg. In midcycle, a surge of pituitary luteinizing hormone, or LH, causes ovulation. The corpus luteum secretes progesterone, which reinforces estrogen and builds up the endometrium to its maximum thickness. If the egg is not fertilized, the corpus luteum degenerates in the last few days of the cycle and the lining is shed during menstruation, which marks the start of a new cycle. If fertilization occurs, about day 14 the fertilized egg secretes human chorionic gonadotrophin, or HCG. This maintains the corpus luteum and its output of progesterone and estrogen so that the endometrium is maintained during pregnancy and menstruation does not occur. The endometrium then nourishes the fertilized egg. |
 | Menstrual Cycle Made a little something-something for a new song I made last night called "Menstrual Cycle" it features my brand new uke that I got last saturday.. an actual real uke...soo proud. either way, if you like what you hear check out my other music @ : www.myspace.com/jemibook oh and p.s. the hammer and sickle sheet i'm laying on is a diy project I did for my friend, i'm not really a communist sadly. |
 | Nazi Rat Pan Menstrual Cycle Kik got him a new panhead... he couldn't resist making a few "tasteful" changes to it. Here he is putting around in my back yard. |
 | Mr. Insensitive "MENSTRUAL CYCLE" Guy!!! CYCLE DOWN? HE AIN'T COMING AROUND? CALL GHETTO KIESHA BONQUISHA... SHE BOUT TO GET ALL UP IN DAT ASS!! WITH ROCAPADS!! LOL... |
 | Take a ride on THE MENSTRUAL CYCLE! This is an ad for the most powerful bike in the history of bikes. THE MENSTRUAL CYCLE. This is a clip from the TV show Doomstink. www.doomstink.com |
 | Lucas Hates The Menstrual Cycle: part 1 Lori and I were bored, so we decided to pull a little prank on our blue banged friend Lucas. When I say blue bangs I don't mean that as an insult. http://youtube.com/user/jambakindy |
 | Menstrual Cycle Pretty lil ditty bout sniffing the bike seats of menstruating women... I"M SORRY! |
 | Lucas Hates The Menstrual Cycle: Part 2 Reaction Lucas's reaction to our menstral prank. |
 | HEALTH FACTS: Relation Between A Migraine & Menstrual Cycle? Harvard's Dr. Bernstein explains how common migraines are during a woman's menstrual cycle. Get more migraine causes & period info at http://www.EmpowHer.com. Help women, share your headache / PMS story & send this to a friend. |
 | Martin the Menstrual Cycle Boy Martin the menstrual cycle boy wants to tell you about his body |
 | The Menstrual Cycle We were hanging out, when we all of a sudden just start talking a little about the menstrual cycle and us just being us. |
 | Re: Mr. Insensitive "MENSTRUAL CYCLE" Guy!!! Video Cam Direct Upload |
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