ANP Exam 1 Study Guide: Chapters 1-4 (Human Body Orientation, Chemistry, Cells, and Tissues)

Chapter 1 – The Human Body: An Orientation

Introduction to Anatomy and Physiology

• Anatomy: The study of the structure of body parts and their relationships to one another.

• Subtypes of Anatomy:

  • Gross (macroscopic) anatomy: Study of large body structures visible to the naked eye.

  • Regional anatomy: All structures in a particular region of the body.

  • Systemic anatomy: Body structure studied system by system.

  • Surface anatomy: Study of internal structures as they relate to the overlying skin.

  • Microscopic anatomy: Includes cytology (cells) and histology (tissues).

  • Developmental anatomy: Study of structural changes throughout the lifespan, including embryology.

  • Specialized types: Pathological anatomy (disease), radiographic anatomy (imaging).

• Physiology: The study of the function of the body and its parts.

• Subtypes of Physiology: Renal, neurophysiology, cardiovascular physiology.

Complementarity of Structure and Function

• Function always reflects structure; what a structure can do depends on its specific form.

• Example: Incisor teeth are sharp for cutting; molars are flat for grinding.

Levels of Structural Organization

• Chemical: Atoms and molecules (e.g., water, proteins).

• Cellular: Cells are the smallest living units (e.g., muscle cells, neurons).

• Tissue: Groups of similar cells (e.g., epithelial, connective, muscle, nervous).

• Organ: Two or more tissue types (e.g., heart, stomach).

• Organ System: Organs working together (e.g., digestive system).

• Organismal: The whole person.

Necessary Life Functions

• Maintaining boundaries: Separation of internal and external environments (e.g., skin, cell membrane).

• Movement: Muscular system, contractility.

• Responsiveness: Ability to sense and respond to stimuli.

• Digestion: Breakdown of food for absorption.

• Metabolism: All chemical reactions in the body (anabolism and catabolism).

• Excretion: Removal of wastes.

• Reproduction: Cellular and organismal levels.

• Growth: Increase in size and number of cells.

Survival Needs

• Nutrients: Carbohydrates, lipids, proteins for energy and cell building.

• Oxygen: Required for energy release (cellular respiration).

• Water: Most abundant chemical in the body.

• Normal body temperature: Needed for metabolic reactions.

• Atmospheric pressure: Required for proper breathing and gas exchange.

Organ Systems Overview

• Integumentary: Skin, protection, vitamin D synthesis.

• Skeletal: Bones, support, protection, hematopoiesis.

• Muscular: Movement, posture, heat production.

• Nervous: Fast-acting control, brain, spinal cord, nerves.

• Endocrine: Hormone secretion, regulation of processes.

• Cardiovascular: Heart, blood vessels, transport of substances.

• Lymphatic/Immune: Fluid return, immunity.

• Respiratory: Gas exchange.

• Digestive: Breakdown and absorption of food.

• Urinary: Waste elimination, water/electrolyte balance.

• Reproductive: Production of offspring.

Homeostasis

• Maintaining a stable internal environment.

• Feedback systems:

  • Negative feedback: Most common; reverses the original stimulus (e.g., temperature regulation).

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

• Components: Stimulus → Receptor → Control Center → Effector → Response.

Anatomical Position and Terminology

• Anatomical position: Standing erect, feet flat, palms forward.

• Directional terms: Superior/inferior, anterior/posterior, medial/lateral, proximal/distal, superficial/deep.

• Regional terms: Refer to specific areas (e.g., nasal, buccal, thoracic).

Body Planes and Sections

• Sagittal: Divides body into right and left.

• Midsagittal: Equal right and left halves.

• Parasagittal: Unequal right and left.

• Frontal (coronal): Anterior and posterior.

• Transverse (cross): Superior and inferior.

• Oblique: Diagonal cuts.

Body Cavities and Membranes

• Dorsal cavity: Cranial (brain) and vertebral (spinal cord).

• Ventral cavity: Thoracic (pleural, pericardial, mediastinum) and abdominopelvic (abdominal, pelvic).

• Serous membranes: Double-layered, reduce friction (e.g., pericardium, pleura, peritoneum).

Abdominopelvic Regions and Quadrants

• Regions: Right/left hypochondriac, epigastric, right/left lumbar, umbilical, right/left iliac, hypogastric.

• Quadrants: Right/left upper, right/left lower.

Other Body Cavities

• Oral, nasal, orbital, middle ear, synovial (joints).

Chapter 2 – Chemistry Comes Alive

Basic Chemistry Concepts

• Matter: Anything that occupies space and has mass.

• Energy: Capacity to do work; includes potential (stored) and kinetic (active) energy.

• Types of energy: Chemical, electrical, mechanical, radiant.

Elements and Atoms

• Elements: Unique substances; main body elements are C, H, O, N (96%).

• Subatomic particles: Protons (+), neutrons (0), electrons (-).

• Nucleus: Contains protons and neutrons; electrons orbit in energy levels.

• Atomic number: Number of protons.

• Atomic mass: Protons + neutrons.

• Isotopes: Atoms with different numbers of neutrons.

Mixtures and Solutions

• Mixtures: Physical combinations of substances.

• Types:

  • Solutions: Homogeneous, solute dissolved in solvent (e.g., saline).

  • Colloids: Heterogeneous, larger particles, scatter light (e.g., cytoplasm).

  • Suspensions: Large particles settle out (e.g., blood).

Chemical Bonds

• Ionic bonds: Electrons transferred; form ions (cations +, anions -).

• Covalent bonds: Electrons shared; can be polar (unequal) or nonpolar (equal).

• Hydrogen bonds: Weak attractions, important in water and DNA structure.

Chemical Reactions

• Types:

  • Synthesis (dehydration): A + B → AB; water removed, forms polymers.

  • Decomposition (hydrolysis): AB → A + B; water added, breaks polymers.

  • Exchange: AB + C → AC + B.

• Exergonic: Release energy; Endergonic: Absorb energy.

• Factors affecting rate: Temperature, concentration, particle size, enzymes.

Enzymes

• Proteins that act as biological catalysts, lower activation energy, reusable, usually end in -ase.

Water and pH

• Body is 60-80% water; high heat capacity, high heat of vaporization, universal solvent, forms hydration layers, involved in chemical reactions, cushions organs.

• pH scale: 0-14; blood pH 7.35-7.45.

• Acids: Donate H+ (e.g., HCl); Bases: Accept H+ (e.g., NaOH).

• Buffers: Resist pH changes; important in blood, lungs, kidneys.

Organic and Inorganic Compounds

• Inorganic: No carbon (e.g., water, salts, acids, bases).

• Organic: Contain carbon; four main groups: carbohydrates, lipids, proteins, nucleic acids.

Organic Molecules

• Carbohydrates: Monosaccharides (glucose), disaccharides (sucrose), polysaccharides (glycogen).

• Lipids: Triglycerides (energy storage), phospholipids (membranes), steroids (hormones).

• Proteins: Amino acids, enzymes, hormones, antibodies; structure: primary, secondary, tertiary, quaternary.

• Nucleic acids: DNA (genetic blueprint), RNA (protein synthesis), ATP (energy).

Chapter 3 – Cells: The Living Units

Cell Structure

• Main parts: Plasma membrane, cytoplasm, nucleus.

• ICF: Intracellular fluid, rich in K+ and amino acids.

• ECF: Extracellular fluid, rich in Na+ and Cl-.

• Interstitial fluid: ECF between cells.

Plasma Membrane

• Phospholipid bilayer with cholesterol, proteins, glycoproteins.

• Selective permeability: Allows some substances to pass, blocks others.

• Resting membrane potential: Maintained by Na+/K+ pumps (3 Na+ out, 2 K+ in).

• Integral proteins: Channels/transporters.

• Peripheral proteins: Receptors for hormones/neurotransmitters.

Cell Junctions

• Tight junctions: Impermeable, found in intestines.

• Desmosomes: Anchoring, found in skin and heart.

• Gap junctions: Communication, found in cardiac muscle.

Membrane Transport

• Passive (no ATP): Simple diffusion, facilitated diffusion, osmosis, filtration.

• Active (requires ATP): Primary (Na+/K+ pump), secondary (symporters, antiporters), vesicular (endocytosis, exocytosis).

• Osmosis: Water movement; tonicity: Hypertonic (cells shrink), hypotonic (cells swell), isotonic (no change).

Vesicular Transport

• Endocytosis: Phagocytosis (solids), pinocytosis (liquids), receptor-mediated.

• Exocytosis: Secretion of substances (e.g., neurotransmitters).

Second Messenger Signaling

• Sequence: Ligand → Receptor → G protein → Enzyme (adenylate cyclase) → Second messenger (cAMP).

Nucleus and Genetic Material

• Nucleus: Control center, contains DNA (genes).

• Nuclear envelope: Double membrane.

• Chromatin: Non-condensed DNA; chromosomes: Condensed DNA (46 in humans).

• Nucleoli: rRNA synthesis.

Cytoplasm and Organelles

• Cytosol: Fluid, site of chemical reactions.

• Organelles:

  • Mitochondria: ATP production, contains DNA/RNA.

  • Ribosomes: Protein synthesis.

  • Rough ER: Protein synthesis (with ribosomes).

  • Smooth ER: Lipid/hormone synthesis.

  • Golgi apparatus: Modifies, packages, secretes proteins.

  • Peroxisomes: Detoxification.

  • Lysosomes: Digestion, recycling, cell death.

  • Cytoskeleton: Structure, movement (microfilaments, intermediate filaments, microtubules).

  • Cilia: Move substances; Flagella: Sperm movement; Microvilli: Increase absorption.

Cell Cycle and Division

• Interphase: Growth, DNA replication.

• Mitosis: Prophase (chromosomes condense), metaphase (align), anaphase (separate), telophase (new nuclei), cytokinesis (cytoplasm divides).

Protein Synthesis

• Transcription: DNA → mRNA (in nucleus).

• Translation: mRNA → protein (in cytoplasm).

• mRNA: Messenger; tRNA: Transfers amino acids; rRNA: Ribosomal.

• Base pairing: A-T (DNA), A-U (RNA), G-C.

• Triplet: 3 DNA bases; Codon: 3 mRNA bases; Anticodon: 3 tRNA bases.

Chapter 4 – Tissue: The Living Fabric

Overview of Tissues

• Four main types: Epithelial, connective, muscle, nervous.

Epithelial Tissue

• Location: Covers surfaces, lines cavities, forms glands.

• Characteristics: Tightly packed, avascular, innervated, apical and basal surfaces, basement membrane, specialized contacts (tight junctions, desmosomes), microvilli, high regeneration.

• Classification: By layers (simple, stratified) and shape (squamous, cuboidal, columnar).

• Simple epithelia:

  • Simple squamous: Diffusion (lungs, serous membranes).

  • Simple cuboidal: Absorption/secretion (kidneys, ovaries).

  • Simple columnar: Absorption/secretion (digestive tract, bronchi).

  • Pseudostratified columnar: Secretion, propulsion (trachea).

• Stratified epithelia:

  • Keratinized stratified squamous: Protection (skin).

  • Nonkeratinized stratified squamous: Moist linings (mouth, esophagus, vagina).

  • Stratified columnar: Glands.

  • Transitional: Stretching (urinary bladder).

• Glands:

  • Endocrine: Ductless, secrete hormones into blood.

  • Exocrine: Ducts, secrete onto surfaces (e.g., sweat, saliva).

  • Unicellular (goblet cells): Mucus secretion.

  • Multicellular: Duct and secretory unit.

• Membranes:

  • Cutaneous: Skin, dry.

  • Mucous: Line cavities open to exterior, moist.

  • Serous: Line closed cavities, double-layered, secrete serous fluid.

Connective Tissue

• Most diverse tissue type.

• Main components: Ground substance, fibers (collagen, elastic, reticular), cells (fibroblasts, chondroblasts, osteoblasts, hematopoietic stem cells).

• Matrix: Extracellular, varies from liquid (blood) to solid (bone).

• Derived from mesenchyme (embryonic tissue).

• Loose connective tissue:

  • Areolar: Under epithelia, all fiber types.

  • Adipose: Fat storage, insulation, cushioning.

  • Reticular: Lymphoid organs.

• Dense connective tissue:

  • Regular: Tendons, ligaments.

  • Irregular: Dermis, organ capsules.

  • Elastic: Arteries, vertebral ligaments.

• Cartilage:

  • Hyaline: Embryonic skeleton, joints.

  • Elastic: Epiglottis.

  • Fibrocartilage: Intervertebral discs, menisci.

• Bone: Hard, calcified, osteocytes in lacunae, vascular, stores minerals.

• Blood: Fluid matrix (plasma), erythrocytes, leukocytes.

• Connective tissue membranes: Synovial membranes (joints).

Muscle Tissue

• Characteristics: Contractile fibers, well vascularized.

• Types:

  • Skeletal: Striated, multinucleated, voluntary, attached to bones.

  • Smooth: Nonstriated, single nucleus, involuntary, walls of organs.

  • Cardiac: Striated, 1-2 nuclei, involuntary, heart.

Nervous Tissue

• Location: Brain, spinal cord, nerves.

• Characteristics: Transmits electrical signals.

• Neuron structure: Dendrites, cell body, axon.

Table: Types of Epithelial Tissue and Their Locations/Functions

Type	Location	Function
Simple squamous	Serous membranes, air sacs of lungs	Diffusion, filtration
Simple cuboidal	Kidney tubules, ovaries	Absorption, secretion
Simple columnar	Digestive tract, bronchi	Absorption, secretion
Pseudostratified columnar	Trachea	Secretion, propulsion
Keratinized stratified squamous	Skin	Protection
Nonkeratinized stratified squamous	Mouth, esophagus, vagina	Protection
Transitional	Urinary bladder	Stretching

Table: Types of Muscle Tissue

Type	Location	Characteristics
Skeletal	Attached to bones	Striated, multinucleated, voluntary
Smooth	Walls of organs	Nonstriated, single nucleus, involuntary
Cardiac	Heart	Striated, 1-2 nuclei, involuntary

Key Equations

• Dehydration synthesis: $A + B \rightarrow AB + H_2O$

• Hydrolysis: $AB + H_2O \rightarrow A + B$

• ATP hydrolysis: $ATP + H_2O \rightarrow ADP + P_i + \text{energy}$

• pH calculation: $pH = -\log_{10}[H^+]$

Additional info: For more detailed examples and diagrams, refer to your textbook or lecture slides as this guide summarizes the main concepts and structures for ANP Exam 1.