Chapter 1: Introduction to Anatomy & Physiology

General Functions of Organ Systems

The human body is organized into 11 major organ systems, each with specific functions essential for survival and homeostasis.

• Organ Systems: Examples include the circulatory, respiratory, digestive, nervous, and musculoskeletal systems.

• Function: Each system contributes to maintaining the internal environment and supporting life processes.

Anatomy vs. Physiology

Anatomy is the study of the structure of body parts, while physiology focuses on their function.

• Anatomy: Examines organs, tissues, and cells.

• Physiology: Investigates how these structures work together.

Key Terms and Concepts

• Cytology: The study of cells.

• Metabolism: The sum of all chemical reactions in the body.

• Hierarchy of Organization: Atom → Molecule → Organelle → Cell → Tissue → Organ → Organ System → Organism.

• Homeostasis: The maintenance of a stable internal environment.

• Feedback Mechanisms: Negative feedback reduces change; positive feedback amplifies it.

• Directional Terminology: Terms such as anterior, posterior, superior, inferior, etc., describe locations and positions in the body.

Chapter 2: Chemical Basis of Life

Atomic Structure and Chemical Bonds

Understanding the structure of atoms and the nature of chemical bonds is fundamental to studying biological molecules.

• Atoms: Consist of protons, neutrons, and electrons.

• Subatomic Particles: Protons (+), neutrons (neutral), electrons (-).

• Electron Shells: Electrons are arranged in shells around the nucleus.

• Chemical Bonds: Ionic, covalent, and nonpolar covalent bonds.

• Exchange Reactions: Atoms or molecules exchange components to form new substances.

Biological Molecules and pH

• Organic Compounds: Include carbohydrates, proteins, lipids, and nucleic acids.

• Monomers: Building blocks of organic compounds (e.g., amino acids, nucleotides).

• pH: Measures acidity or alkalinity; buffers help maintain pH balance.

• Enzymes: Biological catalysts that speed up chemical reactions.

• DNA and RNA: Nucleic acids responsible for genetic information and protein synthesis.

Chapter 3: Cell Structure and Function

Cellular Components

Cells are the basic units of life, containing specialized structures called organelles.

• Ribosomes: Sites of protein synthesis.

• Cell Organelles: Include nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes.

• Plasma Membrane: Composed of a phospholipid bilayer with embedded proteins.

Transport Mechanisms and Protein Synthesis

• Membrane Transport: Passive (diffusion, osmosis) and active (active transport) processes.

• Solutions: Isotonic (equal concentration), hypertonic (higher solute outside), hypotonic (lower solute outside).

• Protein Synthesis: Involves transcription (DNA to RNA) and translation (RNA to protein).

Chapter 4: Tissues

Types and Characteristics of Tissues

The body is composed of four basic tissue types: epithelial, connective, muscle, and nervous tissue.

• Mucous Membranes: Line body cavities open to the exterior.

• Serous Membranes: Line closed body cavities.

• Synovial Membranes: Line joint cavities.

• Connective Tissue: Supports and binds other tissues.

• Epithelial Tissue: Covers surfaces and lines cavities.

• Muscle Tissue: Responsible for movement.

• Nervous Tissue: Conducts electrical impulses.

Chapter 5: The Integumentary System

Structure and Function of Skin

The integumentary system includes the skin, hair, nails, and glands, providing protection and sensory functions.

• Epidermis: Outermost layer; contains various cell types and structures.

• Dermis: Middle layer; contains connective tissue, blood vessels, and nerves.

• Accessory Organs: Hair, nails, sweat glands, sebaceous glands.

• Skin Conditions: Includes albinism, vitiligo, and various skin cancers (basal cell carcinoma, squamous cell carcinoma, melanoma).

• Dermatitis: Inflammation of the skin.

Chapter 6: The Skeletal System

Bone Structure and Function

The skeletal system provides support, protection, and enables movement.

• Bone Shapes: Long, short, flat, irregular.

• Functions of Bones: Support, protection, movement, mineral storage, blood cell formation.

• Hormones: Calcitonin, parathyroid hormone, testosterone, and vitamin D regulate bone metabolism.

• Ossification: Process of bone formation (endochondral and intramembranous).

• Bone Repair: Involves inflammation, bone production, and remodeling.

• Compact vs. Spongy Bone: Compact bone is dense; spongy bone is porous and contains marrow.

Chapter 9: Joints and Movement

Classification and Structure of Joints

Joints connect bones and allow for movement; they are classified by structure and function.

• Functional Classifications: Synarthroses (immovable), amphiarthroses (slightly movable), diarthroses (freely movable).

• Structural Classifications: Fibrous, cartilaginous, synovial joints.

• Types of Muscle Movements: Flexion, extension, abduction, adduction, rotation.

Chapter 10: Muscular System

Muscle Anatomy and Physiology

Muscles produce movement and maintain posture through contraction.

• Tendons vs. Ligaments: Tendons connect muscle to bone; ligaments connect bone to bone.

• Muscle Fiber Anatomy: Includes myofibrils, sarcomeres, and the neuromuscular junction.

• Muscle Contraction: Involves actin and myosin filaments sliding past each other.

• Motor Units: A motor neuron and the muscle fibers it innervates.

Chapter 12: Nervous System

Structure and Function of the Nervous System

The nervous system controls and coordinates body activities through electrical and chemical signals.

• Divisions: Central nervous system (CNS) and peripheral nervous system (PNS).

• Neuron Anatomy: Cell body, dendrites, axon.

• Neuron Classification: Unipolar, bipolar, multipolar.

• Synapse: Junction between neurons for signal transmission.

• Glial Cells: Support and protect neurons; types include astrocytes, oligodendrocytes, microglia.

Chapter 13: Central Nervous System

Brain and Spinal Cord Anatomy

The central nervous system consists of the brain and spinal cord, responsible for processing and integrating information.

• Cerebrum: Largest part of the brain; responsible for higher functions.

• Diencephalon: Includes thalamus and hypothalamus.

• Brainstem: Controls basic life functions.

• Cerebellum: Coordinates movement and balance.

• Spinal Cord: Transmits signals between brain and body.

• Meninges: Protective membranes covering the CNS.

• Cranial Nerves: Twelve pairs, each with specific functions.

Chapter 14: Sensory Systems

Receptors and Sensory Organs

Sensory systems detect and process stimuli from the environment.

• Receptors: Specialized cells that detect changes (photoreceptors, mechanoreceptors, chemoreceptors).

• Eye Anatomy: Includes cornea, lens, retina; responsible for vision.

• Ear Anatomy: Outer, middle, inner ear; responsible for hearing and balance.

• Taste and Smell: Taste buds and olfactory epithelium detect chemical stimuli.

Chapter 15: Autonomic Nervous System

Structure and Function of the Autonomic Nervous System

The autonomic nervous system regulates involuntary body functions such as heart rate, digestion, and respiratory rate.

• Divisions: Sympathetic (fight or flight) and parasympathetic (rest and digest).

• Neurotransmitters: Acetylcholine, norepinephrine.

• Dual Innervation: Organs receive input from both divisions, often with opposing effects.

• Hormonal Effects: Hormones modulate autonomic responses.