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Slide 1 - Gametes… of the sexes Females Eggs Develop in the Ovaries All the gametes an individual will ever produce are already present at birth and are stored as undeveloped follicles Males Sperm is produced in the male scrotum Male gametes arise from undifferentiated stem cells that continually divide and regenerate over the male’s lifetime
Slide 2 - Two Types of Feedback Positive Feedback Negative Feedback Organ or Gland Organ or Gland Releases a substance to act on a system Releases a substance to act on a system System Acted Upon System Acted Upon Releases a secondary substance which acts on the gland or organ Releases a secondary substance which acts on the gland or organ Inhibits (stops) further release of the original substance Promotes or encourages more of the original substance to be released
Slide 3 - Three Primary Hormones of Sexual Development Estrogen Progesterone Testosterone
Slide 4 - Estrogen’s Effects on Female Sexual Development Works with Progesterone through “Feedback Loops” to establish regular reproductive cycles Growth and Maturation of Female Sex Organs During Puberty, triggers lengthening of long bones, and changes in pelvic structure
Slide 5 - Estrogen’s effects on Female Sexual Development (cont…) Stimulates: the appearance of Axillary and Pubic hair, Hydration of the Skin and Female patterns of fat deposits During pregnancy Estrogen also plays a major role (with Progesterone) in Embryonic Development and physical adaptations needed to accommodate Pregnancy and Child Birth
Slide 6 - Testosterone’s Effects on Male Sexual Development Growth and Maturation of Male Sex Organs, Must be held at Adequate levels to maintain functioning of Male Sex Organs At puberty stimulates the growth of axillary, pubic, facial and chest hair. Enlargement of Larynx (deepening voice)
Slide 7 - Testosterone’s Effects on Male Sexual Development (cont…) Thickens Skin and Increases Oiliness Enhances Growth and Density of Bones Increases Muscles in Size and Mass Boosts the Basal Metabolic Rate and Influences Behavior (Sex Drive) “Masculinizes” the Brain (Promotes Aggressiveness)
Slide 8 - Summary of Hormonal Effects Females (Estrogens) Establishes reproductive cycles w/Progesterone Moistens Skin and feminizes shape Promotes fetal growth and phys. changes during pregnancy Males (Testosterone) Promotes growth of facial & chest hair & growth of pharynx Increases mass and density of muscles & bones Boosts BMR, & Masculinizes Brain
Slide 9 - Effects common to both sexesSex Hormones… Promote Maturation and Growth of Sex Organs Promote Elongation of the long bones and eventually trigger the termination of growth Stimulate the growth of Pubic and Axillary Hair.
Slide 10 - This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.