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It Takes Teamwork.

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Presentation on theme: "It Takes Teamwork."— Presentation transcript:

1 It Takes Teamwork

2 Sperm Anatomy Acrosome enzymes: hyaluronidase, acrosin, neuraminidase

3 Fertilization and Implantation
Eggs are viable for 72 hours Sperm is viable for 48 hours Implantation occurs about 5-6 days after conception

4 Male Reproductive System
Functions: 1. testes produce sperm and the male sex hormone testosterone 2. ducts transport, store and assist in maturation of the sperm 3. accessory organs secrete most of the liquid portion of the semen 4. the penis and urethra serve as a passageway for sperm and urine

5 Male Reproductive System
ejaculatory duct prostate gland seminal vesicle bladder urethra bulbourethral gland vas deferens penis epididymus glans penis testes scrotum

6 Female Reproductive System
Functions: 1. ovaries produce secondary oocytes and sex hormones 2. uterine tubes transports secondary oocyte to uterus for fertilization 3. uterus is site of implantation of fertilized ovum, development of fetus, and labor 4. vagina receives the penis during intercourse, passageway for childbirth 5. mammary glands synthesize, secrete, and eject milk

7 Female Reproductive System
Fimbria Fallopian Tube stratum basalis functionalis Prepuce

8 Male : Female Homology Males Females Testes Ovaries Penis Vagina
Glans Penis Clitoris Scrotum Labia Majora Foreskin Prepuce Prostate Gland Greater Vestibule Gland Seminal Vesicle Paraurethral Gland

9 Male Puberty Changes GnRH increase LH/FSH increase
testosterone increase spermatogenesis onset genitalia increase muscle/bone increase hair growth increase voice deepens sweat increase

10 Female Reproductive Cycle Hormones
GnRH (gonadotropin releasing hormone) stimulates the anterior pituitary to release FSH and LH FSH (follicle stimulating hormone) stimulates the follicle growth and estrogen release LH (lutenizing hormone) promotes ovulation and triggers the formation of the corpus luteum Estrogens development and maintenance of female sex characteristics controls fluid and electrolyte balance and increases protein anabolism lowers blood cholesterol and moderate levels inhibit GnRH, LH and FSH Progesterone works with estrogens to prepare endometrium for implantation of ovum prepares mammary glands for milk secretion and inhibits the release of GnRH and LH

11 Menstrual Cycle Ovarian Cycle Uterine Cycle Follicular phase ovulation
luteal phase Uterine Cycle menstrual phase proliferative phase secretory phase

12 Enticement, Excitement and Orgasm
1. Enticement - Sympathetic Nervous System Male/Female become sexually attracted to someone show similar response as “Fight or Flight” response 2. Excitement - Parasympathetic Nervous System Male Erection: arteries in the penis dilate and fill the spongy tissue with blood Spongy tissue traps the blood in sinuses making the penis stay erect Female Lubrication: arteries in the vagina fill blood forcing lubricating fluid out Secretions lubricate the vagina and prepare the genitals for intercourse 3. Orgasm - Sympathetic Nervous System Male Ejaculation: peristaltic contractions propel semen through out of the penis Female Orgasm: peristaltic contractions ripple through the uterus and vagina

13 Hormonal-Dependent Female Sexual Activity
peaks at ovulation

14 Development of Sexual Orientation
Genetics? similarity in twins runs in families Brain Differences? male/female gay/straight Hormones? Environment? increased maternal contact lack of playmates many older brothers

15 Female Sexually Dimorphic Nuclei

16 Male Sexually Dimorphic Nuclei

17 Reproductive System Development
XY chromosomes SRY genes Wolffian Ducts Mullerian Ducts

18 Sex Hormones and Sexual Behavior in the Female rat

19 Sex Hormones and Sexual Behavior in the Male rat

20 Testosterone Myth

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