Foundations of Anatomy & Physiology: Chapters 1-4 Study Guide

Ch. 1: Introduction to Anatomy & Physiology

Levels of Complexity

The human body is organized into hierarchical levels, each increasing in complexity.

• Chemical Level: Atoms and molecules form the basis of all matter.

• Cellular Level: Cells are the basic structural and functional units of life.

• Tissue Level: Groups of similar cells performing a common function.

• Organ Level: Structures composed of two or more tissue types working together.

• Organ System Level: Groups of organs that perform related functions.

• Organism Level: The complete living being.

Life Functions

Essential processes that distinguish living organisms from non-living matter.

• Metabolism: All chemical reactions in the body.

• Responsiveness: Ability to sense and respond to stimuli.

• Movement: Includes motion of the whole body, organs, cells, and organelles.

• Growth: Increase in size and number of cells.

• Reproduction: Formation of new cells or organisms.

• Digestion: Breakdown of food for absorption.

• Excretion: Removal of wastes.

Survival Needs

• Nutrients: Chemicals for energy and cell building.

• Oxygen: Required for metabolic reactions.

• Water: Most abundant chemical in the body.

• Stable Body Temperature: Necessary for chemical reactions.

• Atmospheric Pressure: Required for breathing and gas exchange.

Directional Terminology

Terms used to describe locations and directions on the body.

• Superior/Inferior: Above/below.

• Anterior/Posterior: Front/back.

• Medial/Lateral: Toward/away from midline.

• Proximal/Distal: Near/far from point of attachment.

Body Planes & Regions

• Sagittal Plane: Divides body into left and right.

• Frontal (Coronal) Plane: Divides body into anterior and posterior.

• Transverse Plane: Divides body into superior and inferior.

• Body Regions: Landmarks used for anatomical reference (e.g., abdominal, thoracic).

Homeostasis

The maintenance of a stable internal environment despite external changes.

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

• Positive Feedback: Enhances the effect of the stimulus (e.g., blood clotting).

Ch. 2: Chemical Basis of Life

Energy Types

Energy is the capacity to do work and exists in various forms in the body.

• Chemical Energy: Stored in bonds of chemical substances.

• Electrical Energy: Movement of charged particles.

• Mechanical Energy: Directly involved in moving matter.

• Radiant Energy: Energy that travels in waves.

Atomic Structure

Atoms are the smallest units of matter, composed of subatomic particles.

• Protons: Positively charged, found in nucleus.

• Neutrons: No charge, found in nucleus.

• Electrons: Negatively charged, orbit nucleus.

Atomic Number, Atomic Mass, Atomic Weight

• Atomic Number: Number of protons in nucleus.

• Atomic Mass: Sum of protons and neutrons.

• Atomic Weight: Average mass of all isotopes.

Major Body Elements

• Oxygen (O), Carbon (C), Hydrogen (H), Nitrogen (N): Most abundant elements in the body.

Mixtures: Solution, Colloid, Suspension

• Solution: Homogeneous mixture; solute particles are very small.

• Colloid: Heterogeneous mixture; solute particles are larger but do not settle.

• Suspension: Heterogeneous mixture; solute particles are large and settle out.

Chemical Bonds

• Covalent Bonds: Sharing of electrons.

• Ionic Bonds: Transfer of electrons.

• Polar Bonds: Unequal sharing of electrons.

Factors Influencing Chemical Reactions

• Heat: Increases reaction rate.

• Catalysts: Speed up reactions without being consumed.

• Concentration: Higher concentration increases reaction rate.

Acids/Bases and pH

• Acids: Release hydrogen ions ($H^+$).

• Bases: Release hydroxide ions ($OH^-$).

• pH Scale: Measures hydrogen ion concentration; ranges from 0 (acidic) to 14 (basic).

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

Ch. 3: Cell Structure and Function

Cell Structure Diagram & Components

Cells are the basic units of life, with specialized structures for various functions.

• Cytoskeleton: Provides structural support.

• Cilia: Hair-like projections for movement.

• Microfilaments & Microtubules: Components of cytoskeleton.

• Microvilli: Increase surface area for absorption.

• DNA: Genetic material.

• Chromosome: DNA packaged for cell division.

• Nucleus: Control center of the cell.

• Nuclear Envelope: Surrounds nucleus.

• Nucleolus: Produces ribosomes.

• Cytosol: Fluid portion of cytoplasm.

• Centrosome: Organizes microtubules.

• Basement Membrane: Supports epithelial cells.

Cell Organelles

• Lysosome: Digests cellular waste.

• Smooth ER: Lipid synthesis.

• Rough ER: Protein synthesis (with ribosomes).

• Centriole: Cell division.

• Mitochondrion: Produces ATP (energy).

• Ribosome: Protein synthesis.

• Golgi Apparatus: Modifies and packages proteins.

• Peroxisome: Breaks down fatty acids and toxins.

Cell Cycle

• Interphase: Cell growth and DNA replication.

• Mitosis: Division of nucleus.

  • Prophase

  • Metaphase

  • Anaphase

  • Telophase

• Cytokinesis: Division of cytoplasm.

Membrane Transport

• Exocytosis: Export of substances from cell.

• Endocytosis: Import of substances into cell.

• Passive Transport: No energy required (e.g., diffusion, osmosis).

• Active Transport: Requires energy (ATP).

Membrane Junctions

• Tight Junction: Prevents leakage between cells.

• Gap Junction: Allows communication between cells.

• Desmosome: Provides strong adhesion between cells.

DNA Replication, Transcription, Translation

• DNA Replication: Copying DNA before cell division.

• Transcription: DNA to RNA synthesis.

• Translation: RNA to protein synthesis.

$\text{DNA} \xrightarrow{\text{Transcription}} \text{RNA} \xrightarrow{\text{Translation}} \text{Protein}$

Ch. 4: Tissues

Tissue Identification

Tissues are groups of cells with similar structure and function.

• Simple Squamous Epithelium: Single layer, flat cells; found in lungs.

• Stratified Squamous Epithelium: Multiple layers, flat cells; found in skin.

• Simple Cuboidal Epithelium: Single layer, cube-shaped cells; found in kidneys.

• Pseudostratified Columnar Epithelium: Appears layered, but all cells touch basement membrane; found in respiratory tract.

• Adipose Tissue: Stores fat.

• Reticular Tissue: Supports lymphoid organs.

• Dense Regular Connective Tissue: Parallel collagen fibers; found in tendons.

• Dense Irregular Connective Tissue: Irregular collagen fibers; found in dermis.

• Elastic Tissue: Provides elasticity; found in arteries.

• Hyaline Cartilage: Most common cartilage; found in joints.

• Elastic Cartilage: Flexible; found in ear.

• Fibrocartilage: Tough; found in intervertebral discs.

• Blood: Fluid connective tissue; transports substances.

• Compact Bone: Dense bone tissue.

• Skeletal Muscle: Voluntary movement.

• Cardiac Muscle: Heart muscle; involuntary.

• Smooth Muscle: Walls of hollow organs; involuntary.

• Nervous Tissue: Conducts electrical impulses.

Tissue Functions, Descriptions, and Locations

• Functions: Protection, absorption, secretion, support, movement, communication.

• Descriptions: Based on cell shape, arrangement, and matrix.

• Locations: Specific tissues are found in characteristic body regions (e.g., epithelial in skin, muscle in limbs).

Tissue Classifications

• Connective Tissue: Supports, binds, and protects organs.

• Epithelial Tissue: Covers surfaces and lines cavities.

• Muscle Tissue: Produces movement.

• Nervous Tissue: Transmits signals.

Example: Stratified squamous epithelium forms the outer layer of skin, providing protection against abrasion.