+ Hormones of the Male Reproductive System Robin Gottschalk BIO 260 Professor Tonini December 9, 2015.

Slides:

Advertisements

Similar presentations

Reproductive Hormones

Advertisements

Hormonal Control of Male Reproductive Functions Hormones are secreted by: – Hypothalamus – Anterior pituitary gland – Testes Functions: – Development of.

Hormones Chemical substances - produced by endocrine glands - secreted into the blood - circulate throughout the entire body. - target tissues respond.

Male Reproductive Function Anatomy Hormonal Control Pathophysiology.

Male Reproductive System

The endocrine system HBS 3A.

Hormonal control of Reproduction

Human Reproduction Spermatogenesis.

The Male Reproductive System

Reproductive Hormones

8.5: Reproductive Hormones Male Reproductive System Female Reproductive System.

Endocrinology... The Study of Hormones Today's Warm-up: Name one thing you think hormones are responsible for doing in your body.

Reproductive Hormones

Reproductive Physiology Lecture 1 Hypothalamic-Pituitary-Gonadal axis.

The Hormones GnRH = gonadotropin-releasing hormone FSH = Folicle-stimulating hormone LH = Luteinizing hormone Testosterone Estrogen Progesterone.

Human Reproduction. Objectives: 1. To identify the anatomy of the Male Reproductive System 2. To understand the hormonal controls in sperm production.

UNIT B: Human Body Systems Chapter 8: Human Organization Chapter 9: Digestive System Chapter 10: Circulatory System and Lymphatic System Chapter 11: Respiratory.

Human Biology: Reproductive System

Biology Seminar Testosterone.

By Lennart Nilsson, 1965.

Chapter 15 Reproductive System.

Testosterone Synthesized mainly by leydig cells in the testes, other sources (adrenal cortex and ovarian stroma). Transported bound to plasma proteins.

Accelerated Biology.  Some important vocabulary  Follicle – a cluster of cells that surrounds an immature egg and provides it with nutrients (where.

Reproductive Hormones Gonads Source of sex hormones: androgens estrogens progestins produced in different proportions by both males and females.

Biology 12 Unit 2: Reproduction and Development Male System.

Hormones That Affect Blood Sugar & Reproductive Hormones

PowerPoint ® Lecture Slides prepared by Janice Meeking, Mount Royal College C H A P T E R Copyright © 2010 Pearson Education, Inc. 27 The Male Reproductive.

Male Reproductive System Biology Introduction 1. Primary sex organ (gonads) are the testes 2. Testes produce sperm via ‘spermatogenesis’ – Meiosis.

Reproductive System Basic function = production of a newborn Processes included: 1. Generating the gametes (ova and sperm) 2. Bringing ova and sperm together.

Male Sexual Response: Erection Enlargement and stiffening of the penis from engorgement of __________________________________ with blood During arousal,

Reproductive System Male.

Male Reproductive System. Labeling TestisEpididymis ScrotumVas deferens ProstateSeminal vesicle Urinary bladder Rectum PenisCowper’s Glands Urethra.

9.4 Hormonal Regulation of the Reproductive System

Reproductive Organs and Hormones

LOGO Reproductive System YaoYang, Physiology department of SMC.

27-1 The Male Reproductive System. Objectives: By the end of this session, students will be able to: Differentiate between primary and secondary sex organs.

The Reproductive Glands and Hormones Gonads are ovaries in women and testes in men. −Testes produce testosterone. −Major female hormones Estrogen Progesterone.

MALE REPRODUCTIVE SYSTEM

VIDEO CLIP. ENDOCRINE V. EXOCRINE ENDOCRINE “into” Releases substance (hormone) into the bloodstream EXOCRINE “out of” Releases substance into a duct.

Biology 12 Unit 2: Reproduction and Development Female System.

1. Primary sex characteristics (gonads and sperm) are produced while the fetus is still in utero (testes descend into scrotum at third month of development).

REPRODUCTION Human Reproductive Systems. Human Reproduction and Development Takes place internally Depends on the endocrine system (hormones), nervous.

Introduction to the Endocrine System P Hormones Hormone- chemical regulators produced by cells in one part of the body that affect cells in another.

Reproductive System Ch 19. General Functions of reproductive system.  Produce and nurture sex cells  Gametes  Sperm  Eggs  Transport them to sites.

Colorado Agriscience Curriculum Animal Science Unit 4- Reproduction and Genetics Lesson 3 Male Hormones of Reproduction.

Reproductive System. Overview Introduction Male Reproductive System Female Reproductive System Implantation, Pregnancy and Childbirth.

Aim: How can hormones influence the reproductive cycles in humans? Do Now: Using the diagrams below, which structures produce hormones? What hormones are.

Lesson Overview Lesson Overview The Reproductive System Lesson Overview 34.3 The Reproductive System.

Honors Anatomy & Physiology Chapter 27 Part 2. © 2013 Pearson Education, Inc. Spermatogenesis Sperm (spermatozoa) production in seminiferous tubules most.

Reproduction A Chemical Signal Balancing Act. Testis signaled to make sperm Low Testosterone in blood detected by Hypothalamus Low Testosterone in blood.

The Reproductive System. Review of Endocrine System.

Hormonal Regulation of Male Reproductive Function

Reproductive and Hormonal Functions of the Male: After studying this lecture you should understand: (1)spermatogenesis, which means simply the formation.

Reproduction (1) Lecture Notes.

Male Reproductive System

Lecture 1 Hypothalamic and pituitary gonadal axis

Hormonal Regulation of the Reproductive System

Hormonal Control of Reproductive Tract Function

Colorado Agriscience Curriculum

Higher Human Biology Unit 2

Connections Between the Endocrine and Reproductive Systems

Reproductive Hormones

A – The reproductive system

The Reproductive System

Chapter 11 Review.

Male Reproductive System Review

A Chemical Signal Balancing Act

Regulation of the Reproductive System

A Time of Change.

Male Reproductive System

Presentation transcript:

+ Hormones of the Male Reproductive System Robin Gottschalk BIO 260 Professor Tonini December 9, 2015

+ HormoneSourceAction TestosteroneMostly testes, but some is produced in the adrenal glands -Stimulates formation/regulation of male reproductive ducts, glands, and genitalia -Responsible for libido in males, promotes aggressiveness -At puberty it stimulates: spermatogenesis, growth and maturation of internal and external genitalia, secondary sex characteristics Gonadotropin-releasing Hormone (GnRH) HypothalamusPrompts gonadotropin release Gonadotropins (FSH and LH)Anterior Pituitary-FSH stimulates production of sperm -LH promotes production of testosterone InhibinTestesServes as “barometer” of the normalcy of spermatogenesis

+ The Hypothalamic-Pituitary-Gonadal (HPG) Axis Established at puberty Regulates the testosterone and sperm production Hormonal interactions between the hypothalamus, anterior pituitary gland, and gonads The hormones involved include GnRH, FSH, LH, Testosterone, and Inhibin

+ Sequence of HPG Axis Events 1. The hypothalamus releases gonadotropin-releasing hormone (GnRH)

+ Sequence of HPG Axis Events 2. GnRH binds to pituitary cells (gonadotropic cells), prompting them to secrete FSH and LH

+ Sequence of HPG Axis Events 3. FSH stimulates the sustenocytes to release androgen-binding protein (ABP). -ABP makes the spermatogenic cells receptive to testosterone by keeping the concentration of nearby testosterone high

+ Sequence of HPG Axis Events 4. LH binds to the interstitial endocrine cells surrounding the seminiferous tubules, leading to their release of testosterone. -Locally rising testosterone levels serve as the final trigger for spermatogenesis.

+ Sequence of HPG Axis Events 5. Testosterone entering the bloodstream exerts a number of effects at other body sites.

+ Sequence of HPG Axis Events 6. Feedback inhibition on the hypothalamus and anterior pituitary -Rising levels of testosterone will feed back to inhibit the release of GnRH and the Gonadotropins (both FSH and LH) -Inhibin releases when sperm count is high, stops the release of FSH and GnRH (until sperm count falls below 20million/mL)

+ HPG Axis balance: The 3 interacting sets of hormones (Overview) -GnRH indirectly stimulates the testes via its effects on FSH and LH release -FSH and LH directly stimulate the testes -Testosterone and Inhibin exert negative feedback controls on the hypothalamus and anterior pituitary