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Section 11 - Bio1A Spring 2011 Discussion Section Handout#11 Week of Key Terms Spermatozoa Progesterone Sertoli Cells Spermatocyte Vas deferens

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Bio1A Spring 2011 Discussion Section Handout #11 Week of April 18, 2011 Key Terms: Spermatozoa ovum estrogen Progesterone Androgen Leydig Cells Sertoli Cells Seminiferous tubule spermatogonia Spermatocyte spermatid Epididymis Vas deferens Ejaculatory duct Urethra Seminal vesicles prostate gland bulbourethral gland GnRH Lutenizing Hormone FSH dHT Oogenesis oogonium oocytes ova Granulosa cells Thecal cells Polar Body Follicle Zona Pellucida antrum Corpus Luteum Endometrium Follicular/Luteal phase Cortical granules Acrosome hCG Blastocyst 1. a) What is the chromosome count of the primary spermatocyte and secondary spermatocyte? C count? Primary spermatocyte has 46 chromosomes and 4C DNA; secondary spermatocytes each have 23 chromosomes and 2C DNA. b) How does a secondary oocyte become a ovum? The secondary oocyte is fertilized (the spermatozoa nucleus enters), and then undergoes meiotic division to become an ovum. c) What are the chromosome and C counts of the secondary oocyte and the ovum? Secondary oocyte has 23 chromosomes and 2C DNA; ovum has 23 chromosomes and C DNA (true haploid). 2. Which cells in each structure respond to LH? How about FSH? In the male hormone regulation pathway, the Leydig cells respond to LH and the Sertoli cells respond to FSH. In female hormone regulation pathway, the Theca cells respond to LH and the granulosa cells respond to FSH. a) What similar hormone response occurs in both the follicle and seminiferous tubule to LH and FSH? What are the end results in each tissue (i.e. what final hormone is released)? In both the Leydig cells and the Theca cells, cholesterol is converted to testosterone in response to LH. In both the Sertoli cells and the granulosa cells, testosterone is converted to other hormones in response to FSH. The final product of the Sertoli cells is dHT (dihydrotestosterone), while the final product of the granulosa cells is estrogen. 3. Compare/Contrast Hormonal Control in spermatozoa development and follicle and ovulation development. What feedback pathways are evident in each pathway? What are the key differences in these feedback pathways? Both pathways begin with GnRH secretion by the hypothalamus to the anterior pituitary. The anterior
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This note was uploaded on 09/20/2011 for the course CHEMISTRY 120 taught by Professor Head-gordon during the Spring '11 term at ASU.

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Section 11 - Bio1A Spring 2011 Discussion Section Handout#11 Week of Key Terms Spermatozoa Progesterone Sertoli Cells Spermatocyte Vas deferens

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