Unit 1. Organization of the Body The Human Body: An Orientation Chemistry Comes Alive Cells: The Living Units Tissue: The Living Fabric Unit 2. Covering, Support, and Movement of the Body The Integumentary System Bones and Skeletal Tissue The Skeleton Joints Muscles and Muscle Tissue The Muscular System Unit 3. Regulation and Integration of the Body Fundamentals of the Nervous System and Nervous Tissue The Central Nervous System The Peripheral Nervous System and Reflex Activity The Autonomic Nervous System The Special Senses The Endocrine System Unit 4. Maintenance of the Body Blood The Cardiovascular System: The Heart The Cardiovascular System: Blood Vessels The Lymphatic System and Lymphoid Organs and Tissues The Immune System: Innate and Adaptive Body Defenses The Respiratory System The Digestive System Nutrition, Metabolism, and Body Temperature Regulation The Urinary System Fluid, Electrolyte, and Acid-Base Balance Unit 5. Continuity The Reproductive System Pregnancy and Human Development Heredity