UH BIOL 1361 - Hormones and the Reproductive System (5 pages)

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Hormones and the Reproductive System



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Hormones and the Reproductive System

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The 25th lecture that goes over the role of hormones and also starts the hormones of the reproductive system.


Lecture number:
25
Pages:
5
Type:
Lecture Note
School:
University of Houston
Course:
Biol 1361 - Intro to Biological Science
Edition:
1
Documents in this Packet
Unformatted text preview:

BIOL 1361 1nd Edition Lecture 25 Outline of Last Lecture I Synapse II At Chemical Synapse III Cell Communications and Hormones IV Hormones V Signaling Modes VI Pheromones VII Protein Secretion VIII Hormonal Regulation of Target Cells IX Water Soluble hydrophilic Hormones X Signaling Pathway XI Figure 5 25 XII Signal Transduction Outline of Current Lecture I Lipid Soluble Hormones II Compare and Contrast Receptor Types III Hormonal Regulation of Gametogenesis in Vertebrates IV Hormonal Regulation of Gametogenesis in Vertebrates V Hormones and Spermatogenesis 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 VI Role of Hormones Current Lecture 40 will be comprehensive 60 will be from the Unit 3 material I Lipid Soluble Hormones a Structure i Steroids lipids derived from cholesterol ii Thyroid Hormones tyrosine I b Signaling Pathway i Intracellular receptor 1 Receptors are inside the nucleus 2 The hormone will enter the cell to interact with the receptor 3 Receptors then form a pair 4 Then the proteins can move to the chromosomes to interact with the DNA to turn on process of transcription c Gene Transcription i Lipid soluble hormones cross cell membrane by simple diffusion ii In cytosol hormone binds to receptor iii Hormone receptor complexes form DIMERS before activating gene transcription d Signal Inactivation i Enzymes in liver 1 Break down hormones 2 Add sugars OH or SO4 groups to increase water solubility ii Kidney excretes inactive molecules II Compare and Contrast Receptor Types Plasma Membrane Receptor Intracellular Receptor Hormone Solubility water of lipid Location of Hormone Interaction with Cell Signal Transduction Mechanism III Endocrine Axis a Hypothalamus Pituitary Endocrine Gland Target Tissue flow chart b Regulates metabolism growth stress response reproduction IV Hormonal Regulation of Gametogenesis in Vertebrates a Reproductive endocrine axis i Hypothalamus Pituitary Gonad flow chart ii Gonadotropin releasing hormone GnRH the first arrow 1 Stimulates pituitary gland to make 2 hormones iii Follicle Stimulating Hormone FSH the second arrow iv Luteinizing Hormone LH the second arrow v Steroid Hormones are in the Gonad and can interact with the vi All 3 of those are proteins are water soluble so they ll interact with the plasma membrane b Spermatogenesis i Spermatogonium ii Primary Spermatocyte iii Secondary Spermatocyte iv Spermatids two stages v Sperm Cell vi Occurs in the seminiferous tubules vii Spermatogonia sperm mother cells 46 shromosomes divide by meiosis to produce sperm 23 chromosomes viii Sertoli Cells provide nutrients to spermatocytes V Hormones and Spermatogenesis a GnRH from the hypothalamus i Stimulates pituitary release of LH and FSH b FSH stimulates mitosis of spermatogonia c LH stimulates Leydig cells to produce Testosterone d Testosterone i Initiates meiosis of 1 degree spermatocytes ii Enhances sperm motility iii Has negative feedback on pituitary and hypothalamus VI Role of Hormones a T stimulates fluid secretion from epididymis and seminal vesicle b Estradiol stimulates fluid reabsorption in epididymis promoting sperm concentration


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