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Hormones
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Slide 1

Gametes

Gametes

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 males lifetime

Slide 2

Two Types of Feedback

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

Three Primary Hormones of Sexual Development

Estrogen

Progesterone

Testosterone

Slide 4

Estrogens Effects on Female Sexual Development

Estrogens 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

Estrogens effects on Female Sexual Development (cont)

Estrogens 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

Testosterones Effects on Male Sexual Development

Testosterones 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

Testosterones Effects on Male Sexual Development (cont)

Testosterones 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

Summary of Hormonal Effects

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