A Presentation: by Nancy Clarin & Tiffany Liao. Offspring arise from a single organism and inherit the genes of only that parent. Asexual Reproduction.

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Presentation transcript:

A Presentation: by Nancy Clarin & Tiffany Liao

Offspring arise from a single organism and inherit the genes of only that parent. Asexual Reproduction in Sexual Reproduction Involves the fusion of male and female gametes through fertilization to produce a zygote.

Testes: Produce sperm and sex hormones Epididymides: Sites of maturation and some storage of sperm. Vasa deferentia: conduct and store sperm Seminal vesicles: contribute fluid to semen. Prostate and Bulbourethral glands: contributes fluid and semen. Urethra: Conducts sperm and urine. Penis: organ of copulation. Male Reproductive System

The Testes -A testis has lobules which contain 1-3 seminiferous tubules. -Tubules can add to a length of 250 meters. -Cells undergo spermatogenesis in the seminiferous tubules.

Spermatogonia-Process Video

Hormonal Regulation -The luteinizing hormone (LH) in males, controls androgen testosterone production in the seminiferous tubules. -The hormones allow a negative feedback relationship, that continues sperm and testosterone production. - The main sex hormone in males is testosterone. -Testosterone is necessary for sperm maturation

Sperm -There are three distinct parts of a mature sperm: a head, a middle piece, and a tail. -The middle piece and tail both have microtubules. -Mitochondria, wrapped around the middle piece, supplies the energy to move. -The head is covered by the acrosome (cap-like).

-The average male ejaculates million sperm/mL. -The male can be considered infertile if he only ejaculates 25 million sperm/mL. -Less than 100 sperm actually reach the vicinity of the egg. -Usually only one sperm enters an egg. -The sperm usually travels 2 hours, at 12.5cm/h to reach the egg. Sperm Speeds & More

Ovaries: produce egg and sex cell hormones. Oviducts (fallopian tubes): conduct egg; location of fertilization. Uterus: Houses developing embryo and fetus. Vagina: organ of copulation and serves as birth canal Female Reproductive System

Ovaries -Alternate in producing an oocyte (egg). -produce sex hormones during the ovarian cycle.

Ovarian Cycle Follicular phase ( days 1-13) -FSH -Follicle maturation -Estrogen Ovulation (day 14) -LH spike Luteal phase (days 15-28) -LH -Corpus Luteum -Progesterone

Fertilization -fertilized egg travels to the uterus -increase in estrogen and progesterone shuts down anterior pituitary -no new follicles mature during pregnancy

-STDs can be caused by bacterial or viral infections. Ex: AIDS,genital herpes, hepatitis, chlamydia, gonorrhea, syphilis -Latex condoms are used to prevent the spread of an STD. -Prompt medical treatment should be sought when exposed to an STD. Sexually Transmitted Diseases

Sources "Sexual vs. Asexual Reproduction." Sexual vs. Asexual Reproduction. N.p., n.d. Web. 26 May Mader, Sylvia S. Biology. Boston: WCB/McGraw-Hill, Print. Zimmermann, By Kim Ann. "Reproductive System: Facts, Functions and Diseases." LiveScience. TechMedia Network, 30 Apr Web. 26 May "Human Reproductive System." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 26 May

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