Chapter One: Introduction to Anatomy & Physiology

Homeostasis

Homeostasis is the process by which living organisms maintain a stable internal environment despite changes in external conditions.

• Positive vs. Negative Feedback Mechanisms:

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

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

• Components of a Feedback System:

  • Receptor: Detects changes in the environment.

  • Control Center: Processes information and determines response.

  • Effector: Carries out the response to restore balance.

Directional and Regional Terminology

Directional terms are used to describe the locations of structures in relation to other structures or locations in the body.

• Directional Terms:

  • Superior, inferior, medial, lateral, anterior/ventral, posterior/dorsal, proximal, distal, deep, superficial

• Body Planes:

  • Coronal (frontal), sagittal, transverse (horizontal)

• Body Cavities:

  • Dorsal, cranial, spinal, ventral, thoracic, abdominopelvic

• Body Sections:

  • Transverse, sagittal, midsagittal, frontal/coronal

Body Systems

The human body is organized into systems, each with specific functions essential for survival.

• Major Body Systems: Students should be able to identify the function of each system and the major organs in each.

• Examples: Circulatory system (heart, blood vessels), respiratory system (lungs, trachea), digestive system (stomach, intestines).

Chapter Two: Basic Chemistry for Anatomy & Physiology

Atoms and Associated Charges

Atoms are the basic units of matter, composed of protons, neutrons, and electrons.

• Elements: Pure substances consisting of only one type of atom (e.g., carbon, oxygen).

• Isotopes: Atoms of the same element with different numbers of neutrons.

• Bonds and Their Characteristics:

  • Ionic bonds: Transfer of electrons between atoms.

  • Covalent bonds: Sharing of electrons between atoms.

  • Polar covalent bonds: Unequal sharing of electrons, resulting in partial charges.

  • Hydrogen bonds: Weak attractions between polar molecules, important in water and biological molecules.

Major Organic and Inorganic Chemistry

Organic molecules contain carbon and are essential for life; inorganic molecules do not contain carbon.

• Major Organic Molecules:

  • Lipids: Fats, oils, phospholipids, steroids, triglycerides. Used for energy storage and cell membrane structure.

  • Proteins: Made of amino acids. Functions include structure, enzymes, transport, and signaling.

  • Protein Structure:

    • Primary: Sequence of amino acids

    • Secondary: Alpha helices and beta sheets

    • Tertiary: 3D folding

    • Quaternary: Multiple polypeptide chains

  • DNA vs RNA:

    • Nucleotides involved: DNA (A, T, C, G), RNA (A, U, C, G)

    • Structures: DNA is double-stranded; RNA is single-stranded

    • Functions: DNA stores genetic information; RNA is involved in protein synthesis

    • Types of RNA: mRNA (messenger), tRNA (transfer), rRNA (ribosomal)

    • Codon: Sequence of three nucleotides in mRNA that codes for an amino acid

    • Gene: Segment of DNA that codes for a protein

  • Carbohydrates: Sugars and starches used for energy

pH Scale

The pH scale measures the concentration of hydrogen ions in a solution, indicating its acidity or alkalinity.

• Range: 0 (most acidic) to 14 (most basic), with 7 being neutral.

• Acids vs. Bases: Acids have higher concentrations of H+; bases have lower concentrations.

• Strength Comparison: Each unit change on the pH scale represents a tenfold change in H+ concentration.

• Example: pH 2 is 10 times more acidic than pH 3.

Chapter Three: Cells and Tissues

Cell Organelles

Cell organelles are specialized structures within cells that perform distinct functions necessary for cell survival.

• Major Organelles and Their Functions:

  • Nucleus: Contains genetic material (DNA); controls cell activities.

  • Mitochondria: Produces ATP (energy) through cellular respiration.

  • Endoplasmic Reticulum (ER): Synthesizes proteins (rough ER) and lipids (smooth ER).

  • Golgi Apparatus: Modifies, sorts, and packages proteins and lipids.

  • Lysosomes: Digests cellular waste and foreign material.

  • Ribosomes: Site of protein synthesis.

Cell Membrane and Transport

The cell membrane controls the movement of substances into and out of the cell, maintaining homeostasis.

• Passive Transport:

  • Osmosis: Movement of water across a membrane.

  • Diffusion: Movement of molecules from high to low concentration.

  • Facilitated Diffusion: Diffusion with the help of membrane proteins.

• Active Transport:

  • Phagocytosis: "Cell eating"; engulfing large particles.

  • Pinocytosis: "Cell drinking"; engulfing fluids.

  • Solute Pumps: Use energy to move substances against their concentration gradient.

• Membrane Structure:

  • Phospholipid bilayer: Double layer of phospholipids with embedded proteins.

  • Junctions: Connections between cells (tight, gap, desmosomes).

• Membrane Modifications:

  • Cilia: Hair-like structures for movement.

  • Microvilli: Increase surface area for absorption.

  • Flagella: Tail-like structures for cell movement.

Tissues

Tissues are groups of similar cells that perform a specific function. There are four major tissue types in the human body.

• Types of Tissues:

  • Epithelial Tissue: Covers body surfaces and lines cavities. Functions include protection, absorption, and secretion.

  • Connective Tissue: Supports, binds, and protects organs. Includes bone, blood, cartilage, adipose.

  • Muscle Tissue: Responsible for movement. Types: skeletal, cardiac, smooth.

  • Nervous Tissue: Transmits electrical impulses; found in brain, spinal cord, nerves.

• Characteristics and Locations:

  • Epithelial: Skin, lining of digestive tract.

  • Connective: Tendons, ligaments, fat, bone.

  • Muscle: Attached to bones, heart, walls of hollow organs.

  • Nervous: Brain, spinal cord, peripheral nerves.

Additional info:

• Some details (e.g., specific organelles, tissue locations) were expanded for academic completeness.

• Equations for pH:

• Protein structure levels and DNA/RNA details were inferred for clarity.