Chapter 1: Introduction

Levels of Organization

The human body is organized into hierarchical levels, each with specific structural and functional roles.

• Chemical level: Atoms and molecules

• Cellular level: Cells and their organelles

• Tissue level: Groups of similar cells

• Organ level: Structures composed of multiple tissue types

• Organ system level: Groups of organs working together

• Organismal level: The complete living being

Organ Systems and Basic Functions

There are 11 major organ systems, each responsible for specific life functions such as movement, support, and regulation.

• Examples: Circulatory, respiratory, digestive, nervous, muscular, skeletal, endocrine, integumentary, lymphatic, urinary, reproductive

Necessary Life Functions & Survival Needs

• Necessary life functions: Maintaining boundaries, movement, responsiveness, digestion, metabolism, excretion, reproduction, growth

• Survival needs: Nutrients, oxygen, water, normal body temperature, appropriate atmospheric pressure

Homeostasis

Homeostasis is the maintenance of a stable internal environment.

• Negative feedback: Reduces the effect of the original stimulus (e.g., body temperature regulation)

• Positive feedback: Enhances the original stimulus (e.g., blood clotting)

Anatomical Terms

• Orientation and directional terms: Describe locations (e.g., anterior, posterior, superior, inferior)

• Regional terms: Refer to specific body areas (e.g., brachial, femoral)

Body Planes and Sections

• Planes: Sagittal, frontal (coronal), transverse

• Sections: Cuts along planes to view internal structures

Body Cavities and Membranes

• Major cavities: Dorsal (cranial, vertebral), ventral (thoracic, abdominopelvic)

• Membranes: Serous membranes line cavities and organs

Abdominopelvic Region Division

• Quadrants: Four regions (RUQ, LUQ, RLQ, LLQ)

• Nine regions: More detailed division for anatomical study

Chapter 2: Chemistry

Matter and Energy

Matter is anything that occupies space and has mass; energy is the capacity to do work.

• Forms of energy: Chemical, electrical, mechanical, radiant

Elements of the Human Body (CHON)

• Major elements: Carbon (C), Hydrogen (H), Oxygen (O), Nitrogen (N)

Atom Composition and Structure

• Protons: Positively charged particles

• Neutrons: Neutral particles

• Electrons: Negatively charged particles

• Atomic number: Number of protons

• Atomic mass: Sum of protons and neutrons

Isotopes

Isotopes are atoms of the same element with different numbers of neutrons.

Mixtures

• Solutions: Homogeneous mixtures

• Colloids: Heterogeneous mixtures with larger particles

• Suspensions: Mixtures with visible particles that settle

Valence Electrons and Bonding

• Ionic bonds: Transfer of electrons between atoms (anions and cations)

• Covalent bonds: Sharing of electrons

• Polar covalent bonds: Unequal sharing of electrons

Hydrogen Bonds

Weak attractions between polar molecules, important in water and biological molecules.

Chemical Reactions

• Synthesis (anabolic) reactions: Building larger molecules

• Decomposition (catabolic) reactions: Breaking down molecules

• Exchange reactions: Transfer of atoms between molecules

Properties of Water

• High heat capacity

• High heat of vaporization

• Polar solvent properties

• Reactivity

• Cushioning

Acids and Bases

• pH scale: Measures hydrogen ion concentration

• Neutralization: Acid and base react to form water and salt

• Buffers: Resist changes in pH

Dehydration and Hydrolysis Reactions

• Dehydration synthesis: Forms bonds by removing water

• Hydrolysis: Breaks bonds by adding water

Important Biomolecules

• Carbohydrates: Energy source; monosaccharides, disaccharides, polysaccharides

• Lipids: Energy storage, membrane structure; triglycerides, phospholipids, steroids

• Proteins: Structure, transport, enzymes; made of amino acids

• Nucleic acids: DNA and RNA; genetic information

Protein Structure

• Primary: Sequence of amino acids

• Secondary: Alpha helices and beta sheets

• Tertiary: 3D folding

• Quaternary: Multiple polypeptides

Nucleic Acids

• DNA: Double helix, genetic code

• RNA: Single strand, protein synthesis

• Nucleotide bonds: Phosphodiester bonds

• Base pairing: Adenine-thymine, cytosine-guanine

Chapter 3: The Cell

Cell Theory

All living things are composed of cells; cells are the basic unit of life.

Extracellular Materials

• Extracellular matrix: Provides structural support

Plasma Membrane Composition and Structure

• Phospholipid bilayer: Selective barrier

• Proteins: Receptors, enzymes, transporters

Cell Junctions

• Tight junctions: Prevent leakage

• Desmosomes: Anchor cells together

• Gap junctions: Allow communication

Passive Transport

• Diffusion: Movement from high to low concentration

• Facilitated diffusion: Uses carrier or channel proteins

Active Transport

• Primary active transport: Direct use of ATP

Vesicular Transport

• Endocytosis: Bringing substances into the cell

• Phagocytosis: Engulfing large particles

• Pinocytosis: Engulfing fluids

• Receptor-mediated endocytosis: Specific uptake

• Exocytosis: Expelling substances

Osmolarity and Tonicity

• Osmolarity: Concentration of solutes

• Tonicity: Effect on cell volume (isotonic, hypertonic, hypotonic)

Organelles

• Nucleus: Contains genetic material

• Ribosomes: Protein synthesis

• Endoplasmic reticulum: Rough (protein synthesis), smooth (lipid synthesis)

• Golgi apparatus: Modifies and packages proteins

• Lysosomes: Digestive enzymes

• Peroxisomes: Detoxification

• Mitochondria: ATP production

Cellular Respiration

• Glycolysis: Glucose breakdown

• Citric acid cycle: Energy production

• Electron transport chain: ATP synthesis

Cytoskeleton

• Microfilaments, microtubules: Cell shape and movement

Cell Cycle

• Interphase: G1, S, G2 phases (growth and DNA replication)

• M phase: Mitosis (PMAT: prophase, metaphase, anaphase, telophase) and cytokinesis

Regulation of Cell Division

• Cyclins and CDKs: Control cell cycle progression

Differences Between Mitosis and Meiosis

• Mitosis: Produces identical cells

• Meiosis: Produces gametes with half the chromosome number

Autophagy, Proteosomes, Apoptosis

• Autophagy: Cellular self-digestion

• Proteosomes: Protein degradation

• Apoptosis: Programmed cell death

STEM Cells and Progenitor Cells

• STEM cells: Undifferentiated, can become various cell types

• Progenitor cells: More specialized, limited differentiation

Primary Tissues

Primary Germ Layers

• Ectoderm: Forms skin and nervous system

• Mesoderm: Forms muscle, bone, blood

• Endoderm: Forms lining of digestive and respiratory tracts

Epithelial Tissue

• Properties: Polarity, specialized contacts, supported by connective tissue, avascular, regeneration

• Classification: Simple, stratified, pseudostratified; squamous, cuboidal, columnar

Glandular Epithelium

• Exocrine glands: Secrete products into ducts

• Endocrine glands: Secrete hormones into blood

• Unicellular glands: Mucous and goblet cells

• Multicellular glands: Merocrine, holocrine, apocrine

Connective Tissue

• Main classes: Connective tissue proper, cartilage, bone, blood

• Components: Ground substance, fibers, cells

Muscle Tissue

• Types: Skeletal, cardiac, smooth

Nervous Tissue

• Function: Transmit electrical signals

Covering and Lining Membranes

• Cutaneous membranes: Skin

• Mucous membranes: Line body cavities open to exterior

• Serous membranes: Line closed body cavities

Tissue Repair Steps

• Inflammation: Prepares area for repair

• Organization: Restores blood supply

• Regeneration: Replacement of destroyed tissue

Additional info: These notes expand on the outline provided, adding definitions, examples, and context for foundational Anatomy & Physiology topics. For equations, the atomic mass can be calculated as:

For pH: