Module 1 Study Guide: Overview of Anatomy & Physiology, Basic Chemistry, Cells and Tissues, Skin and Body Membranes

Chapter 1: The Human Body - An Orientation

Introduction to Anatomy and Physiology

• Anatomy: The study of the structure and shape of the body and its parts.

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

• Structure and Function Relationship: The form of a biological structure is closely tied to its function. Example: Simple squamous epithelial cells are thin and flat, ideal for diffusion.

Levels of Structural Organization

• There are six levels of structural organization in the human body:

  1. Chemical: Atoms and molecules

  2. Cellular: Cells, the basic unit of life

  3. Tissue: Groups of similar cells performing a common function

  4. Organ: Structures composed of two or more tissue types

  5. Organ System: Groups of organs working together

  6. Organismal: The human body as a whole

Organ Systems and Their Functions

• There are multiple organ systems, each with specific and overlapping functions.

• Organ systems often work together to carry out complex functions.

• Example: The respiratory and circulatory systems cooperate to deliver oxygen to tissues.

Necessary Life Functions

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

• Movement: Includes movement of the body and substances within the body.

• Responsiveness: Ability to sense and respond to stimuli.

• Nutrient intake and digestion: Obtaining and breaking down food.

• Metabolism: All chemical reactions in the body.

• Disposal of wastes: Removal of waste products.

• Growth: Increase in size and number of cells.

• Reproduction: Production of offspring.

Survival Needs

• Nutrients, oxygen, water, stable body temperature, atmospheric pressure, and balance are essential for survival.

Anatomical Language

• Learning anatomical terminology is crucial for success in anatomy and physiology.

• Practice with flashcards, diagrams, and partners is recommended.

Anatomical Position and Terms

• Anatomical position: Standing upright, facing forward, arms at sides, palms forward.

• Used as a reference for describing locations and directions.

• Learn directional terms (e.g., superior, inferior, anterior, posterior), regional terms, body planes (e.g., sagittal, frontal, transverse), and body cavities (e.g., dorsal, ventral).

Homeostasis

• Homeostasis: Maintenance of a stable internal environment within narrow limits.

• Most homeostatic controls operate via negative feedback, where the response counteracts the change.

• Positive feedback is rare; examples include labor and blood clotting, where the response amplifies the change.

• Three main parts of a homeostatic control system:

  1. Receptor: Detects changes (stimuli).

  2. Control Center: Processes information and determines response.

  3. Effector: Carries out the response.

• Example: Thermoregulation involves skin receptors, the hypothalamus (control center), and sweat glands (effectors).

Chapter 2: Basic Chemistry

Introduction to Chemistry in Biology

• The body is composed of matter and powered by energy.

• Energy: The ability to do work. Forms include kinetic, chemical, mechanical, electrical, and potential.

• Example: Chemical energy is stored in bonds; mechanical energy moves muscles.

Atoms and Elements

• Atoms: Smallest units of matter retaining element properties.

• Composed of protons (positive), neutrons (neutral), and electrons (negative).

• CHON (Carbon, Hydrogen, Oxygen, Nitrogen) make up 96% of living matter.

• Lesser elements (e.g., phosphorus, calcium, potassium) and trace elements (e.g., chromium, cobalt, copper) are also important, often as enzyme cofactors.

Ions and Isotopes

• Ions: Atoms with unequal numbers of protons and electrons.

• Cations: More protons than electrons (positive charge).

• Anions: More electrons than protons (negative charge).

• Isotopes: Atoms of the same element with different numbers of neutrons; behave identically in reactions.

• Radioisotopes: Used in medical imaging.

Atomic Number, Weight, and Mass

• Atomic number: Number of protons.

• Atomic mass: Sum of protons and neutrons.

• Atomic weight: Average mass of all isotopes.

Molecules, Compounds, and Chemical Bonds

• Molecule: Two or more atoms bonded together.

• Compound: Molecule composed of different elements; has emergent properties.

• Types of chemical bonds:

  • Ionic bonds: Transfer of electrons.

  • Polar covalent bonds: Unequal sharing of electrons.

  • Nonpolar covalent bonds: Equal sharing of electrons.

  • Hydrogen bonds: Weak attractions, important in water.

Chemical Reactions

• Decomposition reactions: Break down molecules (e.g., hydrolysis).

• Synthesis reactions: Build molecules (e.g., dehydration synthesis).

• All reactions are reversible; chemical equilibrium is when forward and reverse rates are equal.

• Factors influencing reaction rates: temperature, concentration, size.

Organic and Inorganic Compounds

• Organic compounds: Contain carbon; include carbohydrates, lipids, proteins, nucleic acids.

• Inorganic compounds: Do not contain carbon; water is the most important.

• Water: Vital for life due to its properties (solvent, temperature regulation, etc.).

Acids, Bases, and pH

• Acid: Proton donor.

• Base: Proton acceptor.

• pH: Measures hydrogen ion concentration; scale is logarithmic.

• Blood pH is tightly regulated between 7.35 and 7.45.

• Buffer: Substance that resists changes in pH; carbon dioxide acts as a buffer in blood.

pH Scale Equation

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

• Each unit change in pH represents a tenfold change in proton concentration.

Hydrolysis and Dehydration Synthesis

• Hydrolysis: Breaking bonds by adding water.

• Dehydration synthesis: Forming bonds by removing water.

• Both are important in cellular metabolism.

Biological Molecules

• Carbohydrates: Sugars and starches; monosaccharides (glucose, fructose, galactose), disaccharides (maltose, lactose, sucrose), polysaccharides (starch, glycogen).

• Glucose: Key monosaccharide used to create ATP.

• Lipids: Include triglycerides, phospholipids, steroids, cholesterol; not soluble in water.

• Saturated fats: No double bonds; solid at room temperature.

• Unsaturated fats: One or more double bonds; liquid at room temperature.

• Trans fats: Chemically modified unsaturated fats; increase heart disease risk.

• Proteins: Polypeptide chains folded into 3D shapes; composed of amino acids (20 types).

• Fibrous proteins: Structural (e.g., collagen).

• Globular proteins: Functional (e.g., enzymes).

• Enzymes: Catalysts that speed up reactions without being consumed.

• Nucleic acids: DNA and RNA; composed of sugar backbone and nitrogenous bases.

• DNA: Double helix; base pairing (A-T, C-G); genetic material in nucleus and mitochondria.

• RNA: Single-stranded; involved in transcription and translation; contains uracil instead of thymine.

• ATP: Energy currency of the cell; structure enables rapid energy release.

ATP Hydrolysis Equation

• $\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy}$

Chapter 3: Cells and Tissues

Cell Structure and Function

• Humans are eukaryotes; cells have a true nucleus.

• Cells are mostly water; the body is composed of trillions of cells.

• Basic cell components:

  • Plasma membrane: Boundary of the cell.

  • Nucleus: Contains genetic material.

  • Cytoplasm: Area between membrane and nucleus; contains organelles.

  • Cytosol: Fluid portion of cytoplasm.

Cell Junctions

• Types of cell junctions:

  • Tight junctions: Prevent leakage between cells.

  • Gap junctions: Allow communication; important in the heart.

  • Desmosomes: Provide mechanical strength; important in tissues subject to stress.

Cell Types and Functions

• Over 200 cell types; shape often reflects function.

• Examples: Fibroblasts (produce fibers), epithelial cells (protection), myocytes (muscle contraction).

Membrane Transport

• Diffusion: Passive movement from high to low concentration.

• Facilitated diffusion: Passive, uses carrier proteins.

• Osmosis: Diffusion of water; moves from high water (low solute) to low water (high solute).

• Filtration: Passive movement driven by hydrostatic pressure.

• Active transport: Requires ATP; moves substances against concentration gradient.

• Sodium-potassium pump: Maintains cell potential; moves 3 Na+ out, 2 K+ in per ATP.

• Phosphorylation: Addition of phosphate group; key in ATP production.

• Vesicular transport: Bulk movement; includes exocytosis (out) and endocytosis (in).

Sodium-Potassium Pump Equation

• $3\ \mathrm{Na}^+_{\text{(in)}} + 2\ \mathrm{K}^+_{\text{(out)}} + \mathrm{ATP} \rightarrow 3\ \mathrm{Na}^+_{\text{(out)}} + 2\ \mathrm{K}^+_{\text{(in)}} + \mathrm{ADP} + \mathrm{P}_i$

Cell Cycle and Mitosis

• Cell cycle: Series of events leading to cell division.

• Mitosis: Division of nucleus; cytokinesis: division of cytoplasm.

• Phases of mitosis: prophase, metaphase, anaphase, telophase.

Transcription and Translation

• Transcription: DNA to RNA; occurs in nucleus.

• Translation: RNA to protein; occurs in cytoplasm.

• RNA types: mRNA (messenger), tRNA (transfer), rRNA (ribosomal).

• RNA contains uracil; DNA contains thymine.

Tissue Types

• Four major tissue types:

  • Epithelial: Covers surfaces; protection, absorption, secretion.

  • Connective: Supports, protects, binds; includes bone, blood, cartilage.

  • Muscle: Movement; skeletal, cardiac, smooth.

  • Nervous: Communication; brain, spinal cord, nerves.

• Know locations and functions of each tissue type.

Tissue Repair and Inflammation

• Steps of tissue repair: inflammation, organization, regeneration.

Epithelial Tissue Classification

• Simple epithelium: One layer; absorption, filtration.

• Stratified epithelium: Multiple layers; protection.

• Know functions and locations of each type.

• Endocrine glands: Secrete hormones into blood.

• Exocrine glands: Secrete products into ducts.

Connective Tissue

• Most diverse tissue; includes bone, blood, cartilage, adipose.

• Composed of extracellular matrix: ground substance (mainly water) and fibers.

Muscle Tissue

• Three types: skeletal (voluntary), cardiac (heart), smooth (walls of organs).

• Know differences and similarities; recognize diagrams.

Chapter 4: Skin and Body Membranes

Body Membranes

• Types of membranes:

  • Cutaneous: Skin; protection.

  • Mucous: Lines cavities open to exterior; secretion.

  • Serous: Lines closed cavities; reduces friction.

  • Synovial: Lines joints; lubrication.

  • Epithelial and connective: General categories.

• Know structure and locations of each.

Integumentary System

• Includes skin, sweat and oil glands, hair, nails.

• Critical functions: protection, temperature regulation, sensation, vitamin D synthesis.

Skin Structure

• Two main layers:

  • Epidermis: Superficial; lacks blood supply.

  • Dermis: Deep; contains blood supply.

• Layers of epidermis (deep to superficial): Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum (mnemonic: Big Stupid Goats Love Cheese).

• Most mitotically active cells are near the basement membrane.

Dermis Layers

• Papillary layer: Superficial; contains capillaries and nerve endings.

• Reticular layer: Deep; contains dense connective tissue.

Pigments Affecting Skin Color

• Melanin: Brown-black pigment.

• Carotene: Yellow-orange pigment.

• Hemoglobin: Red pigment in blood.

Homeostatic Imbalances of Skin

• Redness, cyanosis (blue), pallor (pale), jaundice (yellow), bruising (black/blue).

Skin Appendages

• Sweat glands: Thermoregulation.

• Oil glands: Lubrication.

• Hair: Protection; structure includes root, shaft, follicle.

• Nails: Protection; structure includes nail plate, bed, matrix.

• Keratin: Protein in skin, hair, nails; resists desiccation and mechanical trauma.

Burns and Skin Disorders

• Rule of nines: Used to estimate burn area.

• Burn degrees:

  • First-degree: Epidermis only.

  • Second-degree: Epidermis and part of dermis.

  • Third-degree: Entire dermis and epidermis.

  • Fourth-degree: Extends to deeper tissues.

• Skin cancers: Basal cell carcinoma, squamous cell carcinoma, melanoma.

• Common skin disorders: infections, allergies, other issues.