Human Body Course

Lesson 1 • Levels of Structural Organization

Introduces the six levels from chemical to organism, showing how complexity emerges at each tier. Anchors all subsequent anatomy study in a unified framework.

Lesson 2 • Homeostasis and Feedback Mechanisms

Explains how the body maintains stable internal conditions through negative and positive feedback loops. Establishes the physiological principle underlying every organ system.

Lesson 3 • Body Cavities and Membranes

Maps the dorsal and ventral cavities and their subdivisions, plus the serous membranes lining them. Provides spatial context for organ placement studied in later chapters.

Lesson 1 • Cytoplasm and Organelles

Identifies each major organelle, its structure, and its specific metabolic role. Builds understanding of how organelles cooperate to sustain cell life.

Lesson 2 • Nucleus and Genetic Material

Covers nuclear envelope structure, chromatin organization, and the flow of genetic information. Provides the molecular basis for protein synthesis discussed next.

Lesson 3 • Cell Membrane and Transport

Describes the phospholipid bilayer structure and the mechanisms cells use to move substances across it. Connects membrane function to nutrient uptake and waste removal.

Lesson 4 • Cell Cycle and Division

Details interphase, mitosis, and cytokinesis, including checkpoints that regulate division. Establishes the cellular basis for growth, repair, and cancer risk.

Lesson 1 • Muscle Tissue Characteristics

Distinguishes skeletal, cardiac, and smooth muscle by structure and control mechanism. Directly precedes the dedicated muscular system chapter.

Lesson 2 • Nervous Tissue and Signaling

Identifies neurons and glial cells and describes how electrical signals are generated and transmitted. Lays the cellular groundwork for the nervous system chapter.

Lesson 3 • Tissue Repair and Regeneration

Explains the stages of wound healing and factors that determine regeneration versus scar formation. Connects tissue biology to clinical outcomes.

Lesson 4 • Connective Tissue Varieties

Surveys loose, dense, cartilage, bone, and blood as connective tissue subtypes defined by matrix composition. Prepares students for skeletal and cardiovascular chapters.

Lesson 1 • Joints: Classification and Movement

Classifies joints by structure and function, detailing synovial joint anatomy and movement types. Connects joint design to range of motion and injury vulnerability.

Lesson 2 • Major Muscle Groups and Actions

Identifies prime movers, antagonists, and synergists for key body movements using lever system principles. Prepares students for applied movement analysis.

Lesson 3 • Skeletal Muscle Microanatomy

Traces the hierarchy from muscle belly to sarcomere, explaining the sliding filament mechanism. Provides the molecular basis for all contraction events.

Lesson 4 • Bone Structure and Classification

Describes compact and spongy bone histology, periosteum, and bone cell types. Establishes the structural basis for skeletal strength and remodeling.

Lesson 5 • Axial and Appendicular Skeleton

Maps the 206 bones of the adult skeleton into axial and appendicular divisions with key landmarks. Provides spatial reference for muscle attachment and organ protection.

Lesson 1 • Autonomic Nervous System

Contrasts sympathetic and parasympathetic divisions in anatomy, neurotransmitters, and target organ effects. Explains autonomic control of visceral homeostasis.

Lesson 2 • Central Nervous System Organization

Surveys brain regions and spinal cord structure, linking each area to specific functions. Provides the anatomical map for understanding neurological conditions.

Lesson 3 • Peripheral Nervous System and Reflexes

Classifies cranial and spinal nerves and explains reflex arc components and clinical significance. Extends CNS knowledge to peripheral pathways.

Lesson 4 • Synaptic Transmission and Neurotransmitters

Explains chemical synapse events and the major excitatory and inhibitory neurotransmitters. Connects molecular signaling to behavior and pharmacology.

Lesson 1 • Pulmonary Ventilation and Gas Exchange

Explains the mechanics of breathing, lung volumes, and alveolar gas exchange by diffusion. Connects respiratory anatomy to oxygen delivery and CO2 removal.

Lesson 2 • Blood Vessels and Circulation

Compares artery, vein, and capillary wall structure and explains pulmonary versus systemic circuits. Connects vessel design to pressure, flow, and exchange.

Lesson 3 • Respiratory Tract Anatomy

Maps the upper and lower respiratory tracts from nasal cavity to alveoli, noting structural adaptations. Provides the anatomical context for gas exchange mechanics.

Lesson 4 • Blood Pressure and Flow Regulation

Explains determinants of blood pressure and the neural, hormonal, and local mechanisms that regulate it. Links cardiovascular physiology to homeostatic control.

Lesson 1 • Kidney Structure and Urine Formation

Maps nephron anatomy and the three processes of filtration, reabsorption, and secretion. Explains how the kidney regulates blood composition.

Lesson 2 • Digestion and Nutrient Absorption

Details enzymatic breakdown of carbohydrates, proteins, and lipids and their absorption mechanisms. Links digestive chemistry to nutrient delivery to cells.

Lesson 3 • Digestive Tract Structure and Motility

Describes the four-layer wall plan of the GI tract and the motility patterns that move food. Establishes the structural basis for digestion and absorption.

Lesson 4 • Endocrine Glands and Hormone Actions

Identifies major endocrine glands, their hormones, and target-cell mechanisms of action. Shows how hormonal signaling coordinates metabolism, growth, and stress response.

Lesson 1 • Male Reproductive Anatomy and Physiology

Identifies male reproductive organs, spermatogenesis, and hormonal regulation of male function. Provides the anatomical and physiological basis for reproductive health.

Lesson 2 • Innate Immune Defenses

Covers physical barriers, phagocytes, natural killer cells, and the inflammatory response as first-line defenses. Establishes the non-specific foundation before adaptive immunity.

Lesson 3 • Female Reproductive Anatomy and Physiology

Maps female reproductive organs, oogenesis, and the menstrual cycle with its hormonal drivers. Completes the reproductive system picture alongside the male section.

Lesson 4 • Adaptive Immunity and Lymphatic System

Explains antigen presentation, B-cell antibody production, and T-cell cytotoxic responses. Connects lymphatic anatomy to immune surveillance and fluid balance.