MALE REPRODUCTIVE TRACT LECTURE #1 41.1. I. THE GOAL A. To produce fertile sperm that will unite...
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Transcript of MALE REPRODUCTIVE TRACT LECTURE #1 41.1. I. THE GOAL A. To produce fertile sperm that will unite...
![Page 1: MALE REPRODUCTIVE TRACT LECTURE #1 41.1. I. THE GOAL A. To produce fertile sperm that will unite with the female egg to create a new organism.](https://reader035.fdocuments.us/reader035/viewer/2022062322/5697c0151a28abf838cce221/html5/thumbnails/1.jpg)
MALE REPRODUCTIVE TRACT
LECTURE #141.1
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I. THE GOAL
A. To produce fertile sperm that will unite with the female egg to create a new organism.
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II. THE SPERMA. Parts1. Head
a. Contains nucleus which holds the DNA.
b. Acrosome Cap holds enzymes that will help sperm penetrate the egg.
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2. Midpiecea. Holds mitochondria
which supplies energy for movement.
II. THE SPERM (cont)
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3. Taila. Consists of Flagella that
propel the sperm b. Whip-like motionc. Damaged or distorted
tails lessen the chance of getting to the egg first.
II. THE SPERM (cont)
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Mitochondria
Acrosome Cap
II. THE SPERM (cont)
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III. THE JOURNEY
A. Spermato-genesis- The production of sperm.
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A. Spermatogenesis (cont)1. 4 sperm produced
a. Haploid -1/2 the chromosomes2. Takes 74 days to complete
II. THE JOURNEY (cont)
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B. Testis
1.Spermatogenesis takes place here.
a. Inside the seminiferous tubules
II. THE JOURNEY (cont)
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B. Testis (cont)2. Scrotum- The sac that contains the testes.
a. Regulates Temp.b. Spermatogenesis can only occur within 2-3°C of body temperature
II. THE JOURNEY (cont)
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C. Epididymis 1. “Epi” = Upon
“Didymis” = Testis2. Sperm finish maturing here
a. Capable of fertilization, but don’t swim yet!
II. THE JOURNEY (cont)
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D. Vas Deferens- Tube that transports sperm from epididymis to the urethra.1. The vas deferens is cut as a form of birth control (vasectomy)
II. THE JOURNEY (cont)
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E. Urethra-Tube that transports the sperm to the outside of the body.1. Same tube that urine leaves the body through
II. THE JOURNEY (cont)
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2. Ejaculation- The process of sperm (and semen) leaving the body3. Peristaltic (involuntary) contractions move sperm throughout the male tract
a. No swimmers yet!
II. THE JOURNEY (cont)
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II. THE JOURNEY (cont)
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A. 3 Fluids aid in nutrition and movement of sperm1. Seminal Vessicles- Glands that secrete a mucus-like fluid into the vas deferens
a. Provides sugar for sperm for energy
III. SEMEN
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2. Prostate- Gland that secretes a thin, alkaline fluid into the urethra
a. Allows movementb. Alkaline environment protects against
female’s acidic environment.
III. SEMEN (cont.)
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3. Bulbourethral Glands- Glands that secrete a clear, sticky, alkaline fluid that protects sperm.
a. AKA “cowpers gland”b. Located beneath the
prostate
III. SEMEN (cont.)
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B. Fluid from the seminal vesicles, prostate and bulbourethral glands make up the semen.
III. SEMEN (cont.)
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A. Puberty- The onset of secondary sex characteristics that lead to sexual maturity.
IV. HORMONES
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B. Testosterone- Promotes secondary sex characteristics:1. Sperm production2. Deepening of voice3. Increased height & muscle4. Increased hair
IV. HORMONES (cont.)
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C. Follicle Stimulating Hormone (FSH)- Causes production of sperm cells1. Released from the pituitary gland into bloodstream and carried to testes.
IV. HORMONES (cont.)
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D. Luteinizing Hormone (LH)- Causes production of testosterone1. Released from the pituitary gland into bloodstream and carried to testes.
IV. HORMONES (cont.)
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E. Negative Feedback Mechanism 1. Similar to a thermostat2. Ensures that hormones and sperm are not overproduced or under produced.
IV. HORMONES (cont.)
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