Presentation on theme: "Aim: How can hormones influence the reproductive cycles in humans?"— Presentation transcript:
1 Aim: How can hormones influence the reproductive cycles in humans?
2 Who am I? An Adolescent Going Through Puberty Our bodies change. You grow taller & bigger.Our sexual organs mature.Hair appears where there was no hair before.You may begin to feel attracted to another individual.
3 Control of Reproductive Systems The Hypothalamus & Pituitary Gland (in the brain) produce hormones that stimulate the gonads to produce sex hormones
4 What is a hormone? Hormones are chemical messengers There are many different hormones that have unique and specific functions
5 What is a target cell?The cell that a particular hormone will communicate its message to
6 How do hormones travel to their target cells? The Circulatory System!!
7 How do hormones recognize their target cells? Cells must bear a perfectly shaped RECEPTOR for the hormone in order to respond to them.
8 Hormonal Control of the Female Reproductive System: Beginning at puberty, femalereproductive organs undergo acycle of changes that prepare thebody for the possibility ofpregnancy.Menstrual CycleThe hypothalamus, the pituitarygland, and the ovaries producehormones that control this cycleof change.What is this cycle of changecalled?
9 How does a woman get ready to get pregnant? An egg is produced & the lining of the uterus thickens to receive the embryo
11 Menstrual Cycle Stages Follicular Stage:Follicle Stimulating Hormone (FSH) stimulates the ovary to produce estrogen and egg maturationEstrogen causes the lining of uterus to begin to thickenDuration: days
12 2) OvulationIncreased levels of Leutinizing Hormone (LH) causes the release of an egg into the oviductAround day 14
13 3) Corpus Luteum PhaseOvaries continue to secrete estrogen & progesterone to further thicken the lining of the uterusDuration days
14 What is MENSTRUATION?Hormone levels decreaseShedding of the uterine lining andunfertilized eggDuration: 3-7 days
15 What happens if fertilization does occur? The levels of progesterone will remain elevated in order to maintain the thickness of the uterine liningNicknamed the “pregnancy hormone”
16 Hormones & the menstrual cycle Which hormones peak before ovulation?Which hormone peaks afterovulation?
17 Girls Secondary Sex Characteristics Hips widenPubic HairBreasts enlargeDue to the hormones estrogenand progesterone.
18 Hormonal Regulation of the Testes: Beginning at puberty, the pituitary gland secretes FSH & LH.These hormones stimulate the testes to produce testosterone.Testosterone stimulates the production of sperm and other male sex characteristics.
19 Boys Secondary Sex Characteristics Voice DeepensFacial HairMuscular DevelopmentPubic HairSperm ProductionDue to the hormoneTestosterone.