MODULE 3_ LESSON 8 ASSIGNMENT.docx - MODULE 3 LESSON 8 ASSIGNMENT 1 The hormonal control of the menstrual cycle can seem complicated so it is important


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MODULE 3: LESSON 8 ASSIGNMENT 1. The hormonal control of the menstrual cycle can seem complicated, so it is important to go through the cycle step by step. Complete “Investigation 14.B: The Menstrual Cycle” on page 500 of the textbook. Answer: Analysis 1: FSH increases during the follicle stage, which is between day one and six. The follicle stage is the first stage of the ovarian cycle where levels of FSH stimulate follicles to release increased quantities of estrogen and progesterone into the blood causing the release of an egg from the follicle. Analysis 2: LH hits its highest concentration on the 13th day. This causes LH to stimulate the formation of the corpus luteum which secretes progesterone and some estrogen, which stimulates the endometrium to thicken for the implantation of the embryo. Analysis 3: LH starts to decline in blood once the corpus luteum starts to secrete progesterone and some estrogen. Analysis 4: The level of estrogen in the blood increases most rapidly when the follicle matures. As it matures, it releases estrogen and progesterone, which causes estrogen levels in the blood to rise and act on the pituitary gland to inhibit the release of FSH. Estrogen triggers the release of GnRH from the hypothalamus leading to a sharp increase in LH production by the anterior pituitary gland and triggers ovulation. Analysis 5: The levels of progesterone in the blood increased most rapidly around day 14. This is after ovulation in which the released progesterone of the corpus
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