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<!DOCTYPE html>
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<title>Chapter 22: The Reproductive System | Physiology Study Guide</title>
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<div class="nav-chapters">
<a href="index.html" class="nav-ch">Home</a>
<a href="physiology-guide-ch20.html" class="nav-ch">Ch 20</a>
<a href="physiology-guide-ch22.html" class="nav-ch active">Ch 22</a>
<a href="physiology-guide-ch23.html" class="nav-ch">Ch 23</a>
<a href="practice-quiz.html" class="nav-ch">Practice Test</a>
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<div class="page-wrapper">
<aside class="sidebar">
<div class="sidebar-title">Sections</div>
<ul class="sidebar-nav">
<li><a href="#overview">1. Overview</a></li>
<li><a href="#gametes">2. Gametes & Meiosis</a></li>
<li><a href="#sex-determination">3. Sex Determination</a></li>
<li><a href="#male-anatomy">4. Male Anatomy</a></li>
<li><a href="#male-hormones">5. Male Hormonal Regulation</a></li>
<li><a href="#spermatogenesis">6. Spermatogenesis</a></li>
<li><a href="#male-response">7. Male Sexual Response</a></li>
<li><a href="#female-anatomy">8. Female Anatomy</a></li>
<li><a href="#oogenesis">9. Oogenesis</a></li>
<li><a href="#menstrual">10. Menstrual Cycle</a></li>
<li><a href="#female-hormones">11. Female Hormonal Regulation</a></li>
<li><a href="#fertilization">12. Fertilization</a></li>
<li><a href="#pregnancy">13. Pregnancy & Development</a></li>
<li><a href="#parturition">14. Parturition & Lactation</a></li>
</ul>
</aside>
<main>
<header class="chapter-header">
<span class="chapter-label">Chapter 22</span>
<h1>The Reproductive System</h1>
<p class="subtitle">How gametes are made, hormones coordinate cycles, and new life begins</p>
</header>
<!-- Section 1: Overview -->
<section class="section" id="overview">
<div class="section-header">
<span class="section-num">1</span>
<h2>Overview: The Big Picture</h2>
</div>
<div class="card card-concept">
<h4>Two Goals of Reproduction</h4>
<ul>
<li><strong>Make gametes:</strong> Haploid sperm and eggs (each with 23 chromosomes)</li>
<li><strong>Combine gametes:</strong> Form a diploid zygote (46 chromosomes) → embryo → baby</li>
</ul>
</div>
<div class="quick-facts">
<div class="fact"><div class="fact-label">Autosomes</div><div class="fact-value">22 pairs (44 total)</div></div>
<div class="fact"><div class="fact-label">Sex Chromosomes</div><div class="fact-value">1 pair: XX (female) or XY (male)</div></div>
</div>
<div class="card card-remember">
<h4>Key Terms Made Simple</h4>
<ul>
<li><strong>Gamete:</strong> Mature sperm or egg (haploid, n=23)</li>
<li><strong>Zygote:</strong> Fertilized egg (diploid, 2n=46)</li>
<li><strong>Gestation:</strong> Pregnancy (~40 weeks)</li>
<li><strong>Parturition:</strong> Birth!</li>
</ul>
</div>
</section>
<!-- Section 2: Gametes & Meiosis -->
<section class="section" id="gametes">
<div class="section-header">
<span class="section-num">2</span>
<h2>Gametes & Meiosis: Making Haploid Cells</h2>
</div>
<div class="card card-process">
<h4>Why Meiosis?</h4>
<p>If gametes were diploid like regular cells, the zygote would have 92 chromosomes! Meiosis <strong>halves the chromosome number</strong> so fertilization restores 46.</p>
</div>
<div class="card card-concept">
<h4>Meiosis in 2 Steps</h4>
<div class="flow">
<span class="flow-item">1 Diploid cell (46 chromosomes)</span>
<span class="flow-arrow">→</span>
<span class="flow-item"><strong>Meiosis I:</strong> Homologous chromosomes separate</span>
<span class="flow-arrow">→</span>
<span class="flow-item">2 Haploid cells (23 chromosomes, each with 2 chromatids)</span>
<span class="flow-arrow">→</span>
<span class="flow-item"><strong>Meiosis II:</strong> Sister chromatids separate</span>
<span class="flow-arrow">→</span>
<span class="flow-item">4 Haploid gametes (23 single chromosomes)</span>
</div>
</div>
<div class="card card-remember">
<h4>Genetic Diversity Boosters</h4>
<ul>
<li><strong>Crossing over:</strong> Homologous chromosomes swap segments in Prophase I</li>
<li><strong>Independent assortment:</strong> Random alignment in Metaphase I → 8 million+ combos!</li>
</ul>
</div>
</section>
<!-- Section 3: Sex Determination -->
<section class="section" id="sex-determination">
<div class="section-header">
<span class="section-num">3</span>
<h2>Sex Determination: It's All About the Y</h2>
</div>
<div class="card card-concept">
<h4>The srY Gene is the Master Switch</h4>
<ul>
<li><strong>srY gene</strong> on Y chromosome → makes <strong>testis-determining factor (TDF)</strong></li>
<li><strong>With TDF:</strong> Bipotential gonads become <strong>testes</strong></li>
<li><strong>Without TDF:</strong> Bipotential gonads become <strong>ovaries</strong></li>
</ul>
</div>
<div class="card card-remember">
<h4>Female = Default Pathway</h4>
<p>No signal needed for female development. Male development requires active hormones from testes:</p>
<table style="width: 100%; margin-top: 0.5rem;">
<tr><th>Testes Secrete</th><th>Effect</th></tr>
<tr><td><strong>Testosterone</strong></td><td>→ Wolffian ducts → Male structures (epididymis, vas deferens)</td></tr>
<tr><td><strong>MIH</strong></td><td>→ Mullerian ducts degenerate</td></tr>
</table>
<p><strong>No testes?</strong> Wolffian ducts disappear, Mullerian ducts become female structures (uterus, tubes).</p>
</div>
</section>
<!-- Section 4: Male Anatomy -->
<section class="section" id="male-anatomy">
<div class="section-header">
<span class="section-num">4</span>
<h2>Male Anatomy: Sperm Factory & Delivery System</h2>
</div>
<div class="card card-concept">
<h4>Testes: Dual Function</h4>
<ul>
<li><strong>Seminiferous tubules:</strong> Where sperm are made (with Sertoli cells)</li>
<li><strong>Leydig cells:</strong> Between tubules; make testosterone</li>
</ul>
</div>
<div class="card card-process">
<h4>Sperm Highway</h4>
<div class="flow">
<span class="flow-item">Seminiferous tubules</span>
<span class="flow-arrow">→</span>
<span class="flow-item">Epididymis (maturation)</span>
<span class="flow-arrow">→</span>
<span class="flow-item">Vas deferens</span>
<span class="flow-arrow">→</span>
<span class="flow-item">Urethra</span>
</div>
</div>
<div class="card card-concept">
<h4>Semen = Sperm + Fluid</h4>
<table style="width: 100%; margin-top: 0.5rem;">
<tr><th>Gland</th><th>Contribution</th></tr>
<tr><td>Testes</td><td>Sperm</td></tr>
<tr><td>Seminal vesicles</td><td>60-70% of volume: fructose (sperm energy), prostaglandins</td></tr>
<tr><td>Prostate</td><td>25-30%: citric acid, enzymes</td></tr>
<tr><td>Bulbourethral glands</td><td>Clear mucus (lubrication)</td></tr>
</table>
</div>
</section>
<!-- Section 5: Male Hormonal Regulation -->
<section class="section" id="male-hormones">
<div class="section-header">
<span class="section-num">5</span>
<h2>Male Hormonal Control: Steady as She Goes</h2>
</div>
<div class="card card-process">
<h4>The Feedback Loop</h4>
<div class="flow">
<span class="flow-item">Hypothalamus → GnRH</span>
<span class="flow-arrow">→</span>
<span class="flow-item">Pituitary → FSH + LH</span>
</div>
<div class="flow">
<span class="flow-item">LH → Leydig cells → Testosterone</span>
</div>
<div class="flow">
<span class="flow-item">FSH → Sertoli cells → Spermatogenesis</span>
</div>
</div>
<div class="card card-remember">
<h4>Negative Feedback Keeps Balance</h4>
<ul>
<li><strong>Testosterone</strong> → brain → ↓ GnRH/LH</li>
<li><strong>Inhibin</strong> (from Sertoli cells) → pituitary → ↓ FSH only</li>
</ul>
<p><strong>Result:</strong> Stable sperm and testosterone production!</p>
</div>
</section>
<!-- Section 6: Spermatogenesis -->
<section class="section" id="spermatogenesis">
<div class="section-header">
<span class="section-num">6</span>
<h2>Spermatogenesis: From Stem Cell to Sperm</h2>
</div>
<div class="card card-concept">
<h4>Sperm Parts & Functions</h4>
<ul>
<li><strong>Head:</strong> Nucleus (23 chromosomes) + acrosome (enzymes for egg penetration)</li>
<li><strong>Midpiece:</strong> Mitochondria (energy for tail)</li>
<li><strong>Tail:</strong> Propels sperm with whip-like motion</li>
</ul>
</div>
<div class="card card-process">
<h4>Step-by-Step Production</h4>
<ol>
<li><strong>Spermatogonium (2n):</strong> Stem cell on basement membrane</li>
<li><strong>Mitosis:</strong> One stays as stem cell; one becomes primary spermatocyte</li>
<li><strong>Meiosis I:</strong> Primary spermatocyte → 2 secondary spermatocytes (n, but 2 chromatids)</li>
<li><strong>Meiosis II:</strong> → 4 spermatids (n)</li>
<li><strong>Spermiogenesis:</strong> Spermatids → mature sperm (remodeling takes ~64 days)</li>
</ol>
</div>
<div class="card card-process">
<h4>Sperm Maturation Timeline</h4>
<ul>
<li><strong>0-20 days:</strong> In seminiferous tubules → <strong>immotile</strong></li>
<li><strong>20-60 days:</strong> In epididymis → gain motility</li>
<li><strong>60+ days:</strong> In vas deferens → stored until ejaculation</li>
</ul>
</div>
</section>
<!-- Section 7: Male Sexual Response -->
<section class="section" id="male-response">
<div class="section-header">
<span class="section-num">7</span>
<h2>Male Sexual Response: Point and Shoot</h2>
</div>
<div class="table-wrap">
<table>
<tr><th>Phase</th><th>Nervous Control</th><th>What Happens</th></tr>
<tr><td><strong>Erection</strong></td><td>Parasympathetic</td><td>Arterioles dilate → blood fills erectile tissue → veins compressed → rigid penis</td></tr>
<tr><td><strong>Emission</strong></td><td>Sympathetic</td><td>Sperm + fluids move into urethra</td></tr>
<tr><td><strong>Ejaculation</strong></td><td>Sympathetic</td><td>Semen expelled through urethra</td></tr>
</table>
</div>
<div class="card card-remember">
<h4>Memory Trick</h4>
<p><strong>"Point" = Parasympathetic</strong> (erection)<br><strong>"Shoot" = Sympathetic</strong> (emission + ejaculation)</p>
</div>
</section>
<!-- Section 8: Female Anatomy -->
<section class="section" id="female-anatomy">
<div class="section-header">
<span class="section-num">8</span>
<h2>Female Anatomy: Cyclic System for One Egg at a Time</h2>
</div>
<div class="card card-concept">
<h4>Ovaries: Egg & Hormone Center</h4>
<ul>
<li><strong>Follicles:</strong> Each contains 1 immature egg (oocyte)</li>
<li><strong>Granulosa cells:</strong> Surround oocyte; make estrogen</li>
<li><strong>Theca cells:</strong> Outer layer; make testosterone (converted to estrogen by granulosa)</li>
</ul>
</div>
<div class="card card-process">
<h4>Uterine Layers</h4>
<table style="width: 100%; margin-top: 0.5rem;">
<tr><th>Layer</th><th>Function</th></tr>
<tr><td><strong>Endometrium (inner)</strong></td><td>Sheds monthly; where embryo implants</td></tr>
<tr><td><strong>Myometrium (middle)</strong></td><td>Thick smooth muscle → powerful contractions during labor</td></tr>
<tr><td><strong>Perimetrium (outer)</strong></td><td>Protective serosa</td></tr>
</table>
</div>
<div class="card card-concept">
<h4>Uterine Tubes: Egg's Highway</h4>
<ul>
<li><strong>Fimbriae:</strong> Finger-like projections that "sweep" egg into tube</li>
<li><strong>Cilia:</strong> Move egg toward uterus (takes ~4 days)</li>
<li><strong>Fertilization site:</strong> Usually in ampulla (widest part)</li>
</ul>
</div>
</section>
<!-- Section 9: Oogenesis -->
<section class="section" id="oogenesis">
<div class="section-header">
<span class="section-num">9</span>
<h2>Oogenesis: A Life-Long Egg Journey</h2>
</div>
<div class="card card-concept">
<h4>Key Differences from Spermatogenesis</h4>
<ul>
<li><strong>Fixed egg supply:</strong> All oogonia formed before birth</li>
<li><strong>Meiosis pauses:</strong> Stops in Prophase I until puberty</li>
<li><strong>Meiosis finishes only after fertilization!</strong></li>
<li><strong>1 egg per cycle:</strong> Polar bodies get discarded</li>
</ul>
</div>
<div class="card card-process">
<h4>Oogenesis Timeline</h4>
<p><strong>Fetal Life:</strong> Oogonia → Primary oocytes → Meiotic arrest (Prophase I)</p>
<p><strong>Puberty to Menopause:</strong> Each month, 1 primary oocyte resumes meiosis → completes Meiosis I → <strong>Secondary oocyte + 1st polar body</strong></p>
<p><strong>After Fertilization:</strong> Secondary oocyte completes Meiosis II → <strong>Ovum + 2nd polar body</strong></p>
</div>
<div class="card card-remember">
<h4>Why Polar Bodies?</h4>
<p>They discard extra chromosomes while conserving cytoplasm/nutrients for the egg. Only the mature ovum gets the resources!</p>
</div>
</section>
<!-- Section 10: Menstrual Cycle -->
<section class="section" id="menstrual">
<div class="section-header">
<span class="section-num">10</span>
<h2>Menstrual Cycle: Two Cycles in Sync</h2>
</div>
<div class="quick-facts">
<div class="fact"><div class="fact-label">Total Cycle Length</div><div class="fact-value">~28 days</div></div>
<div class="fact"><div class="fact-label">Ovulation Day</div><div class="fact-value">~Day 14</div></div>
</div>
<div class="card card-concept">
<h4>Ovarian vs Uterine Cycles</h4>
<table style="width: 100%; margin-top: 0.5rem;">
<tr><th>Ovarian Phase</th><th>Days</th><th>Uterine Phase</th><th>Key Hormone</th></tr>
<tr><td>Follicular</td><td>1-14</td><td>Menstrual → Proliferative</td><td>Estrogen ↑</td></tr>
<tr><td>Luteal</td><td>15-28</td><td>Secretory</td><td>Progesterone ↑</td></tr>
</table>
</div>
<div class="card card-process">
<h4>Follicular Phase (Days 1-14)</h4>
<ul>
<li>Few follicles start developing → 1 becomes <strong>dominant</strong></li>
<li>Granulosa cells produce <strong>estrogen</strong></li>
<li>Estrogen rebuilds endometrium (<strong>proliferative phase</strong>)</li>
<li>High estrogen → triggers <strong>LH surge</strong> → ovulation</li>
</ul>
</div>
<div class="card card-concept">
<h4>Luteal Phase (Days 15-28)</h4>
<ul>
<li>Ruptured follicle → <strong>corpus luteum</strong></li>
<li>Corpus luteum makes <strong>progesterone + estrogen</strong></li>
<li>Progesterone prepares endometrium for implantation (<strong>secretory phase</strong>)</li>
<li><strong>No pregnancy?</strong> Corpus luteum degenerates → hormones drop → menstruation</li>
<li><strong>Pregnancy?</strong> hCG saves corpus luteum!</li>
</ul>
</div>
</section>
<!-- Section 11: Female Hormonal Regulation -->
<section class="section" id="female-hormones">
<div class="section-header">
<span class="section-num">11</span>
<h2>Female Hormonal Control: The Estrogen Flip</h2>
</div>
<div class="card card-process">
<h4>The Two-Cell Model of Estrogen Production</h4>
<div class="flow">
<span class="flow-item">LH → Theca cells → Testosterone</span>
<span class="flow-arrow">→</span>
<span class="flow-item">Testosterone → Granulosa cells → Estrogen</span>
</div>
<p>Both cell types must work together!</p>
</div>
<div class="card card-remember">
<h4>Estrogen's Dual Role</h4>
<ul>
<li><strong>Low/Moderate levels:</strong> ↓ GnRH/LH/FSH (<strong>negative feedback</strong>)</li>
<li><strong>High levels (late follicular):</strong> ↑ GnRH/LH (<strong>positive feedback</strong> → LH surge!)</li>
</ul>
</div>
<div class="card card-process">
<h4>Progesterone's Role</h4>
<ul>
<li>From corpus luteum after ovulation</li>
<li><strong>Prepares endometrium</strong> for implantation</li>
<li><strong>Suppresses uterine contractions</strong> (prevents miscarriage)</li>
<li><strong>Blocks new ovulation</strong> (via strong negative feedback)</li>
</ul>
</div>
</section>
<!-- Section 12: Fertilization -->
<section class="section" id="fertilization">
<div class="section-header">
<span class="section-num">12</span>
<h2>Fertilization: Race to the Egg</h2>
</div>
<div class="quick-facts">
<div class="fact"><div class="fact-label">Sperm Survival</div><div class="fact-value">Up to 5 days</div></div>
<div class="fact"><div class="fact-label">Egg Survival</div><div class="fact-value">12-24 hours</div></div>
</div>
<div class="card card-process">
<h4>Sperm's Journey</h4>
<ol>
<li>Ejaculated into vagina</li>
<li>Swim through cervix → uterus → uterine tubes</li>
<li>Undergo <strong>capacitation</strong> (activation in female tract)</li>
</ol>
</div>
<div class="card card-concept">
<h4>Fertilization Steps</h4>
<ol>
<li>Sperm bind to <strong>corona radiata</strong> (egg's outer layer)</li>
<li>Acrosome reaction → enzymes digest <strong>zona pellucida</strong></li>
<li>First sperm fuses with egg membrane</li>
<li><strong>Cortical reaction:</strong> Zona hardens → blocks polyspermy!</li>
<li>Egg completes meiosis II</li>
<li>Sperm + egg pronuclei fuse → <strong>zygote</strong></li>
</ol>
</div>
</section>
<!-- Section 13: Pregnancy & Development -->
<section class="section" id="pregnancy">
<div class="section-header">
<span class="section-num">13</span>
<h2>Pregnancy: From Zygote to Fetus</h2>
</div>
<div class="card card-process">
<h4>First Week Timeline</h4>
<div class="flow">
<span class="flow-item">Day 1: Fertilization</span>
<span class="flow-arrow">→</span>
<span class="flow-item">Day 3: Morula (solid ball)</span>
<span class="flow-arrow">→</span>
<span class="flow-item">Day 5: Blastocyst (hollow ball)</span>
<span class="flow-arrow">→</span>
<span class="flow-item">Day 6-7: Implantation</span>
</div>
</div>
<div class="card card-concept">
<h4>Key Structures</h4>
<ul>
<li><strong>Blastocyst:</strong>
<ul>
<li><strong>Trophoblast:</strong> Becomes placenta</li>
<li><strong>Inner cell mass:</strong> Becomes embryo</li>
</ul>
</li>
<li><strong>Placenta:</strong> Fetal + maternal tissue; exchanges gases/nutrients/wastes</li>
<li><strong>hCG:</strong> Pregnancy hormone; detected by tests; saves corpus luteum</li>
</ul>
</div>
<div class="card card-process">
<h4>Hormonal Handoff</h4>
<ul>
<li><strong>Weeks 1-8:</strong> Corpus luteum makes progesterone/estrogen</li>
<li><strong>Week 8+:</strong> Placenta takes over hormone production</li>
</ul>
</div>
</section>
<!-- Section 14: Parturition & Lactation -->
<section class="section" id="parturition">
<div class="section-header">
<span class="section-num">14</span>
<h2>Birth & Breastfeeding: The Grand Finale</h2>
</div>
<div class="card card-process">
<h4>Parturition = Oxytocin Positive Feedback</h4>
<div class="flow">
<span class="flow-item">Uterine contractions</span>
<span class="flow-arrow">→</span>
<span class="flow-item">Cervix stretches</span>
<span class="flow-arrow">→</span>
<span class="flow-item">Oxytocin release</span>
<span class="flow-arrow">→</span>
<span class="flow-item">Stronger contractions</span>
<span class="flow-arrow">→</span>
<span class="flow-item">Baby born!</span>
</div>
</div>
<div class="card card-concept">
<h4>Lactation Hormones</h4>
<ul>
<li><strong>Prolactin:</strong> Makes milk (stimulated by suckling)</li>
<li><strong>Oxytocin:</strong> Ejects milk ("let-down reflex")</li>
</ul>
</div>
<div class="card card-remember">
<h4>Colostrum vs Mature Milk</h4>
<ul>
<li><strong>Colostrum (days 1-5):</strong> Antibody-rich; protects newborn</li>
<li><strong>Mature milk:</strong> Nutrient-rich; supports growth</li>
</ul>
</div>
</section>
<!-- Chapter Summary -->
<div class="chapter-summary">
<h3>Key Takeaways</h3>
<ul>
<li>Meiosis makes haploid gametes; fertilization restores diploid number</li>
<li><strong>srY gene = male switch</strong>; female is default pathway</li>
<li>Male: Steady testosterone/sperm via negative feedback</li>
<li>Female: Cyclic changes driven by estrogen (flip from negative → positive feedback)</li>
<li>Follicular phase = egg maturation + estrogen rise → LH surge → ovulation</li>
<li>Luteal phase = corpus luteum makes progesterone → prepares for pregnancy</li>
<li>Fertilization requires capacitated sperm + blocks polyspermy</li>
<li>hCG rescues corpus luteum in early pregnancy</li>
<li>Birth = oxytocin positive feedback loop</li>
<li>Lactation: prolactin (milk synthesis) + oxytocin (milk ejection)</li>
</ul>
</div>
<div class="cta">
<a href="practice-quiz.html">Take the Practice Test</a>
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