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Ateneo de Manila University*
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BIOLOGY MISC
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Feb 10, 2024
Uploaded by siwan21 on coursehero.com

IMG_20240206_115726.jpg

School
Ateneo de Manila University*
*We are not endorsed by this school
Course
BIOLOGY MISC
Pages
1
Upload Date
Feb 10, 2024
Uploaded by siwan21 on coursehero.com
'1 Enough estrogen in the blood induces one follicle to absorb liquid rapidly e€xpand, rupture, and release an ovum (mature egg cell). This process jg called ovulation. After ovulation, the follicle shrinks and the layers that surround the ovyp, now form the corpu 8 luteum. The corpus luteum Produces the other female sex hormone - progesterone, which together with es:trogen Causeg the uterine lining to become a soft, blood-rich bed to receive a fertilizeg ovum. FEEDBACK MECHANISM GnRH from the hypothalamus causes the pituitary gland to release FSH and LH. Follicles in the ovaries also release estrogen and progesterone. FSH stimulates egg cell production. When egg cell production needs to be controlled, the follicles produce inhibin to inhibit FSH. LH on the other hand helps in egg cell development, ovulation, and stimulates estradio] and progesterone production in the ovaries. Estradiol is one form of estrogen. Estrogen, as discussed above, helps in endometrium or uterine lining growth, the menstrual cycle, and pregnancy. It is also responsible for female secondary sex characteristics like breast development, changes in body composition and fat mass, and growth of pubic hair. Progesterone maintains the endometrium, and also inhibits FSH and LH to be released. These hormones need to be carefully controlled by feedback mechanisms. During the ovarian cycle, or the preparation of the release of egg cells, FSH and LH levels rise in order to grow follicles for egg ovulation, or having an egg cell be released from the ovary into the fallopian tube. As follicles grow, estrogen and progesterone are released. Around the middle of the cycle, a high level of estrogen causes FSH and LH to quickly rise, and then abruptly fall. This spike causes ovulation. If egg cell fertilization does not occur, estrogen and progesterone levels will decrease, and the whole process will start again with the release of GnRH, FSH, and LH for another cycle. 12
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