<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
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</head>
<body>

  
  <div class="hub">
    <span>Respiration</span>
    <span class="hub-energy">⚡ ATP Energy</span>
  </div>

  
  <div class="branches-grid">
    
    
    <div class="branch-card active" id="card-0" onclick="selectBranch(0)">
      <div class="card-title">1. Synthesis</div>
      <div class="visual-box">
        <div class="synthesis-wrap">
          <div style="display:flex; gap:3px;">
            <span class="monomer"></span>
            <span class="monomer"></span>
          </div>
          <span style="color:#a855f7;">+ ⚡ →</span>
          <div class="polymer">
            <span class="monomer"></span>
            <span class="monomer"></span>
            <span class="monomer"></span>
          </div>
        </div>
      </div>
      <div class="card-tag">Monomers → Polymers</div>
    </div>

    
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      <div class="card-title">2. Active Transport</div>
      <div class="visual-box">
        <div class="membrane-wrap">
          <div class="ion-zone" style="justify-content: flex-end; gap: 4px;">
            <span style="font-size:9px; color:#065f46; font-weight:700;">High [ ]</span>
            <span class="ion">+</span><span class="ion">+</span><span class="ion">+</span>
          </div>
          <div class="membrane-bar">
            <div class="pump-gate">Pump</div>
          </div>
          <div class="pump-arrow">▲</div>
          <div class="ion-zone" style="justify-content: flex-start; gap: 4px;">
            <span class="ion">+</span>
            <span style="font-size:9px; color:#065f46; font-weight:700;">Low [ ]</span>
          </div>
        </div>
      </div>
      <div class="card-tag">Against Gradient</div>
    </div>

    
    <div class="branch-card" id="card-2" onclick="selectBranch(2)">
      <div class="card-title">3. Muscle & Heat</div>
      <div class="visual-box">
        <div class="muscle-wrap">
          <div class="fibers-bar">
            <span style="font-size:9px; color:#b91c1c;">◀</span>
            <span style="font-size:9px; font-weight:700; color:#991b1b;">Muscle</span>
            <span style="font-size:9px; color:#b91c1c;">▶</span>
          </div>
          <div class="temp-badge">
            <span>🌡️</span> 37°C Constant
          </div>
        </div>
      </div>
      <div class="card-tag">Contraction + Warmth</div>
    </div>

  </div>

  
  <div class="detail-view">
    <span class="detail-text" id="detail-title">Synthesis / Building:</span>
    <span class="detail-summary" id="detail-desc">Combining glucose into glycogen/starch & amino acids into proteins.</span>
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        desc: "Powers protein pumps to move mineral ions against their concentration gradient."
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        title: "Movement & Thermoregulation:",
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</html>

Cellular Respiration: An Exothermic Continuous Process

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<html lang="en">
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UK-GCSE-SCIENCE-BIO-CB

Child standards (4)

Aligned learning resources

Related diagrams