LBOBI19 LE 1.1 Questions and Correct Answers/ Latest 2026/2027 Update / Already Graded A+

LBOBI19 LE 1.1 Questions and Correct Answers/ Latest 2026/2027 Update / Already Graded A+ What do the theca interna cells secrete in response to luteinizing hormone (LH) stimulation? - ANSWER-Androgens. What enzyme do the granulosa cells produce in response to follicle stimulating hormone (FSH) stimulation? - ANSWER-Aromatase. What is the name of the cavity filled with fluid that indicates further development of the follicle? - ANSWER-Antrum. What causes the expansion of the cumulus oophorus? - ANSWER-Stimulation by factors secreted by the oocyte. What are the characteristics of primordial follicles? - ANSWER-Contain the primary oocyte surrounded by a thin layer of squamous follicle (granulosa) cells and an external basal lamina. What are the characteristics of primary follicles? - ANSWER-Contain the oocyte surrounded by the developing zona pellucida and an outer layer of granulosa cells that have become cuboidal. What are the characteristics of secondary follicles? - ANSWER-Contain the oocyte surrounded by a fully developed zona pellucida, multiple layers of granulosa cells, the basal lamina, and two outermost layers of theca folliculi cells. 2 | Page What are the characteristics of tertiary or Graafian follicles? - ANSWER-Have a cavity (antrum) formed within the cumulus formed by granulosa cells. At this point, some of the granulosa cells have retained surrounding the oocyte, forming the corona radiata external to the zone pellucida. What are the phases of spermatogenesis? - ANSWER-Phase 1: Origin & Migration of Germ Cells, Phase 2: Increase in number of germ cells by mitosis, Phase 3: Reduction in chromosomal number by meiosis, Phase 4: Events during Spermiogenesis Where do primordial germ cells originate and migrate during early embryonic development? - ANSWER-Primordial germ cells arise outside the gonads and migrate into the gonads from the yolk sac → hindgut → dorsal mesentery → primordia of the gonads. What stimulates the entry of spermatogonia into meiosis? - ANSWER-Retinoic acid. What are the two types of spermatogonia and their roles? - ANSWER-Type A spermatogonia are the stem cell population that mitotically maintains proper number of spermatogonia throughout life of a male, while Type B 3 | Page spermatogonia arise from Type A spermatogonia and are destined to enter meiosis. What is the role of Sertoli cells in spermatogenesis? - ANSWER-They support the progression of spermatogonia and nourish them. What is the role of the acrosome cap in spermiogenesis? - ANSWER-It is an enzymefilled structure that plays a crucial role in fertilization. What is the area in the testes where sperm production occurs? - ANSWER Seminiferous tubules. Where are spermatogonia usually found? - ANSWER-Along the periphery of the tubule. Which cells are the largest among spermatogenic cells? - ANSWER-Primary spermatocytes. What are the characteristics of secondary spermatocytes? - ANSWER-Slightly smaller than primary spermatocytes; some with highly condensed chromatin. What are spermatids? - ANSWER-Very small, round cells. What is another term for primordial cell? - ANSWER-Spermatogonium or Oogonium.