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NRSG 112 ch 2 notes
Course: Ob/peds (112)
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University: Ivy Tech Community College of Indiana
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CHAPTER 2 HUMAN REPRODUCTIVE ANATOMY AND PHYSIOLOGY
Boys grow taller, more muscular, and develop pubic and facial hair and a deepened
voice.
Girls experience menarche, broadened hips, breasts, and pubic and axillary hair.
Rapid change in boys and girls during which the reproductive system matures and
becomes capable of reproduction
Begins when the secondary sex characteristics (e.g. pubic hair) appear
Ends when mature sperm are formed or when regular menstrual cycles occur
**transition from childhood to adulthood, some cultures celebrate
The hormone levels in the male are constant, not cyclic as in females.
Male-
Hormonal changes normally begin between 10 and 16 years
Outward changes become apparent when the size of penis and testes increases and
there is a general growth spurt
Testosterone (primary male sex hormone) causes the boy to grow taller, more muscular
and develop secondary sex characteristics:
1. Pubic hair
2. Facial hair
3. Deeper voice-often squeaks or cracks before reaching its final pitch
Testosterone levels are constant, not cyclical as female hormones
Nocturnal emissions “wet dreams” may occur without sexual stimulation (usually do not
contain sperm)
What is the first outward change of puberty in males?
1) Development of pubic hair
2) Nocturnal emissions
3) Voice deepens
4) Penis and testes increase in size
Male (internal)
Testes, Vas Deferens, prostate, seminal vesicles, ejaculatory ducts, urethra, and
accessory glands
Testes-Manufacture male germ cells (spermatozoa or sperm) and secrete male
hormones (androgens)
Testosterone (most abundant male sex hormone begins with the anterior pituitary
gland, The hypothalamus directs the anterior pituitary gland to secret follicle-stimulating
hormone (FSH) and luteinizing hormone (LH). These hormones initiate the production of
testosterone in the Leydig cells of the testes.
Other related effects of Testosterone:
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