BIO 241 1st Edition Lecture 31 Outline of Last Lecture I. Semen (seminal fluid)II. PenisIII. Female reproductive organsIV. OvaryV. OögenesisVI. Follicles and the ovarian cycle IVII. Follicles and the ovarian cycle IIVIII. Uterine tubesIX. UterusOutline of Current Lecture II. Vagina III. Female reproductive cycleIV. Estrogen secretion and controlCurrent LectureII. The vagina has rugae (folds) similar to the stomach, which allows for the vagina to stretch when excited sexually. The entrance into the vagina is known as the introitus also called the orifice. The vaginal tissue is composed of stratified squamous epithelium which helps with abrasion. There are no vaginal glands. There is a cervical mucous gland that composes the mucous plug which blocks the cervix from foreign agents. The transudation of tissue fluid is what lubricates the vagina for intercourse. Cells secrete glycogen which provide food for natural microbes. These natural microbes use the glycogen and produce acid, which accounts for the acidity of the vagina. III. Combining the uterine and ovarian cycle constructs the female reproductive cycle. This is directly controlled by hormones. These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.IV. Estrogen is secreted by follicular cells prior to ovulation and by the corpus luteum after ovulation. Low levels of estrogen allow Gn-RF secretion and the anterior pituitary gland to secrete FSH, which initiates follicular development at the beginning of a new cycle. High levels of estrogen allow Gn-RF secretion and the anterior pituitary gland to secrete LH, which stimulates ovulation,thus leading to formation of the corpus luteum. Moderate levels of estrogen inhibit Gn-RF secretion and therefore inhibits FSH and
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