The reproductive system
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The Reproductive System. Chapter 34 Ms. Luaces Honors Biology. 34.3 Sexual Development. Sex hormones determine the pattern of development Females respond to estrogens , which stimulate breast development, widening of the hips, and egg production

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The Reproductive System

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The reproductive system

The Reproductive System

Chapter 34

Ms. Luaces

Honors Biology


34 3 sexual development

34.3 Sexual Development

  • Sex hormones determine the pattern of development

    • Females respond to estrogens, which stimulate breast development, widening of the hips, and egg production

    • Males respond to testosterone, which stimulates growth of facial hair, increased muscular development, and deepening of the voice

    • Most of these changes occur during puberty (ages 9-15) when the hypothalamus signals the pituitary to produce 2 hormones: FSH and LH


34 3 male reproductive system

34.3 Male Reproductive System

  • Testosterone stimulates puberty, which will result in the ability to reproduce through the production of sperm


34 3 male reproductive system1

34.3 Male Reproductive System

  • Some important structures:

    • Testes: site of sperm production

    • Scrotum: holds the testes

    • Seminiferous tubules: site of sperm development

    • Epididymis: site of sperm maturation & storage

    • Vas deferens: merges with urethra, opening to release sperm

    • Semen: a mixture of sperm and lubricating seminal fluid


34 3 female reproductive system

34.3 Female Reproductive System

  • FSH stimulates ovaries to produce egg cells and prepares the female’s body to nourish a developing embryo

  • One ovary usually produces and releases 1 mature ovum every 28 days: menstruation


34 3 female reproductive system1

34.3 Female Reproductive System

  • Some important structures:

    • Fallopian tubes: Where the egg is released into and awaits a sperm for fertilization

    • Uterus: Where the growing embryo will develop

    • Cervix: The opening to the uterus

    • Vagina: Entrance into the female reproductive system; egg and uterine lining will be discarded through here


34 3 female reproductive system2

34.3 Female Reproductive System

  • Menstruation is split into 4 phases:

    • Follicular phase: Pituitary secretes FSH & LH, stimulates estrogen release and causes the lining of the uterus to thicken (~12 days)

    • Ovulation: releases an egg into the fallopian tube for fertilization (~1-2 days)

    • Luteal Phase: Corpus luteum continues to release estrogen and progesterone, growing the uterine lining in prep for an embryo (~6 days)

    • Menstruation: unfertilized egg, lining of uterus and blood are discarded (~5-7 days)

      • Menopause: the permanent stop of the menstrual cycle at about age 40


Sexually transmitted diseases std s

Sexually Transmitted Diseases (STD’s)

  • 1 in 4 girls age 14-19 are infected with an STD, which can include:

    • Bacterial STD’s: Chlamydia, Gonorrhea and Syphilis

    • Viral STD’s: Hepatitis B, Genital Herpes, Genital Warts (HPV) & AIDS

    • How do you prevent an STD? Abstinence is the only 100% effective method. Condoms cannot completely guard from STD’s!!


34 4 fertilization development

34.4 Fertilization & Development

  • The fusion of a sperm and egg cell is called fertilization

    • Usually occurs in the fallopian tube

    • Once fertilization occurs, the fertilized egg is called a zygote

    • Two eggs can be fertilized at the same time by different sperm – fraternal twins

    • One egg can be fertilized and split into two separate zygotes – identical twins


34 4 fertilization development1

34.4 Fertilization & Development

  • About 6-7 days after fertilization, the blastocyst attaches to the wall of the uterus – known as implantation

    • Now it undergoes differentiation (gastrulation) – various types of tissue of the body are formed, including ectoderm, endoderm, and mesoderm. Eventually, neurulation takes places also (making of the nervous system)


34 4 fertilization development2

34.4 Fertilization & Development

  • The placenta will protect and nourish the embryo, allowing exchange of oxygen and nutrients with the mother

    • Mother and baby blood do not mix


34 4 fertilization development3

34.4 Fertilization & Development

  • After 8 weeks, the embryo is now called a fetus.

    • Most major organs fully formed

  • During months 4-6, the fetal heart becomes large enough to hear through a stethoscope, the bone develops, and the mother may be able to feel the baby


34 4 fertilization development4

34.4 Fertilization & Development

  • During months 7-9, the fetus matures, gains weight, and completes the development of lungs and the nervous system

    • Babies born before 8 months are premature and may have breathing problems


34 4 fertilization development5

34.4 Fertilization & Development

  • Childbirth is signaled by the release of the hormone oxytocin, which stimulates contractions of the uterus and starts labor

    • Once the cervix is open, the baby is able to pass through the birth canal

    • A babies first cough or cry helps to rid the lungs of fluid. The umbilical cord will be clamped and cut


34 4 fertilization development6

34.4 Fertilization & Development

  • The placenta and amniotic sac will also be dispelled after birth

  • Prolactin hormone will be released and stimulate the production of milk

    • AIDS, Rubella, drugs, alcohol and smoking can harm the babies development


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