<div class="c-section-headers-number-list_container"> <h4>UNIT 1: ORGANIZATION OF THE BODY</h4> <ol> <li>The Human Body: An Orientation</li> <li>Chemistry Comes Alive</li> <li>Cells: The Living Units</li> <li>Tissue: The Living Fabric</li> </ol> <h4>UNIT 2: COVERING, SUPPORT, AND MOVEMENT OF THE BODY</h4> <ol start="5"> <li>The Integumentary System</li> <li>Bones and Skeletal Tissue</li> <li>The Skeleton</li> <li>Joints</li> <li>Muscles and Muscle Tissue</li> <li>The Muscular System</li> </ol> <h4>UNIT 3: REGULATION AND INTEGRATION OF THE BODY</h4> <ol start="11"> <li>Fundamentals of the Nervous System and Nervous Tissue</li> <li>The Central Nervous System</li> <li>The Peripheral Nervous System and Reflex Activity</li> <li>The Autonomic Nervous System</li> <li>The Special Senses</li> <li>The Endocrine System</li> </ol> <h4>UNIT 4: MAINTENANCE OF THE BODY</h4> <ol start="17"> <li>Blood</li> <li>The Cardiovascular System: The Heart</li> <li>The Cardiovascular System: Blood Vessels</li> <li>The Lymphatic System and Lymphoid Organs and Tissues</li> <li>The Immune System: Innate and Adaptive Body Defenses</li> <li>The Respiratory System</li> <li>The Digestive System</li> <li>Nutrition, Metabolism, and Body Temperature Regulation</li> <li>The Urinary System</li> <li>Fluid, Electrolyte, and Acid-Base Balance</li> </ol> <h4>UNIT 5: CONTINUITY</h4> <ol start="27"> <li>The Reproductive System</li> <li>Pregnancy and Human Development</li> <li>Heredity</li> </ol> </div>