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- 1. The diagram in Figure 1 shows a section through the mammalian testis. With reference to this diagram answer the following questions: Hormone secreting cells B A- C FIGURE 1a. An ovary consists of numerous embedded in a layer called the immediately beneath the ovary's surface and abundantly supplied with b. follicles. c. At begin to develop within the و a follicle gradually approaches the surface of the ovary and bursts; the and fluid contents of the follicle are liberated onto the exterior of the ovary and carried in the by currents set up by the movements of cilia covering theE B A В Identify the structure that secretes the hormone involved in the development of the secondary male sex characteristics and contributes to spermatogenesis. Select one: a. D, which is the Sertoli cell b. A, which is the spermatocyte O c. C, which is the sperm cell O d. B, which is the interstitial cell
- 1. The diagram in Figure 1 shows a section through the mammalian testis. With reference to this diagram answer the following questions: Hormone secreting cells A FIGURE 1 What percentage of each of the following types of cells would you expect to contain an X chromosome. Give a REASON for your answer in each case. i) type cell A ii) type cell B Name the cell type labelled B which under goes mitosis. State the importance of mitosis in a mature testis. State TWO ways in which cell division results in cell C being genetically different from one another. The graph in Figure 2 shows the effect of light on the period of oestrus in two groups of female sheep. The females in the control group were subjected to the normal seasonal variation in day length. Partially through the first year of the experiment, sheep in the experimental group were subjected to reversed day-length cycle. The period of oestrus of each group of sheep is shown in solid bands above the graph (Figure 2).4. What is the major control centers of oogenesis that secretes ecdysone?A. headB. fat bodiesC. ovariesD. corpora allata 5. Which of the following does not pertain to the panoistic ovarioles?A. Trophocyte and oocyte originate from a single oogonium.B. Most primitive type of ovarioles and absence of trophocytes.C. Each developing oocyte is surrounded by the follicular epithelium. D. Follicular plug exists between adjacent oocyte.1. The diagram in Figure 1 shows a section through the mammalian testis. With reference to this diagram answer the following questions: Hormone secreting cells State TWO ways in which cell division results in cell C being genetically different from one another.
- In the development of the female sex organs: a. all ducts in the 7-week embryo become Wolffian ducts. b. the SRY gene is activated. c. anti-Mullerian hormone is secreted. d. the Mullerian ducts develop into oviducts. e. the mother secretes oxytocin.In the embryonic development of the eye: a. the optic vesicle cells permanently adhere to each other to prevent movement, whereas the optic cup cells are very motile. b. the optic cup induces the surface ectoderm to form the lens placode. c. gradients determine that the ectoderm overlying the lens vesicle develops into the optic vesicle. d. microtubules powered by myosins and microfilaments powered by dyneins move the eye components around in the head region. e. cadherins function in the presence of calcium to allow the lens placode and optic cup to break apart.1. Discuss the hypothalamic-pituitary-ovarian axis and the physiologic basis for the interplay of the various hormones involved in the axis. 2. Give the phase of the menstrual cycle and correlate the histologic features seen in the: (a) Endometrium, (b) ovary
- 9. The pituitary gland releases follicle stimulating hormone (FSH). This hormone stimulates the ovary to produce around five to 20 follicles (tiny nodules or cysts), which bead on the surface. * A. True B. False 10. The hypothalamus in the brain recognizes these rising levels and releases a chemical called gonadotrophin-releasing hormone (GNRH). This hormone prompts the pituitary gland to produce raised levels of luteinizing hormone (LH) and FSH. * A. True B. False 11. This hormone is produced by the pituitary gland. It regulates the functions of both the ovaries and testes. * A. Follicle Stimulating Hormone (FSH) B. Luteinizing Hormone (LH) C. Estrogen D. Progesterone 12.This hormone plays an important role in sexual development and functioning. In women, LH helps control the menstrual cycle. It also triggers the release of an egg from the ovary. * A. Follicle Stimulating Hormone (FSH) B. Luteinizing Hormone (LH) C. Estrogen D. Progesterone 13. helps make women curvier than men by…Identify 3 effects of Human Chorionic Gonadotrophin (HCG) in pregnancy. Select one or more: ☐a. This helps to ensure the endometrium is ready to receive the implantation of the embryo b. This is linked to the severity of morning sickness or hyperemesis gravidarum in pregnant women OC. Helps regulate oxytocin receptors in the myometrium O d. Promotes the maintenance of the corpus luteum at the beginning of pregnancyIdentify 3 effects of progesterone on pregnancy. Select one or more: O a. This causes the uterus to remain contracted after delivery to reduce blood loss from the placental site O b. This is produced when the ovarian follicle that encloses the developing egg forms a structure called the corpus luteum O c. This decreases bladder tone leading to an increased risk of urinary infection O d. This prepares the body for pregnancy. It acts as an appetite stimulant Identify 1 effect of the hormone vasopressin in pregnancy. Select one: O a. This has an important compensatory mechanism for restoring blood pressure in hypovolaemic shock such as that which occurs during haemorrhage O b. Promotes the maintenance of the corpus luteum at the beginning of pregnancy O C. Involved in thickening of the endometrium and other aspects of regulating the menstrual cycle
