Anatomy & Physiology: Foundational Concepts and Systems Study Guide

Chapter 1: Introduction to Anatomy and Physiology

Definitions and Relationships

Anatomy and physiology are foundational sciences in understanding the human body. Anatomy studies the structure of body parts, while physiology focuses on their function.

• Anatomy: The study of the structure and relationships between body parts.

• Physiology: The study of how body parts function and work together.

• Difference: Anatomy is about "what" and "where"; physiology is about "how" and "why".

Levels of Organization in the Human Body

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

• Chemical level: Atoms and molecules

• Cellular level: Cells and their organelles

• Tissue level: Groups of similar cells

• Organ level: Structures composed of two or more tissue types

• Organ system level: Groups of organs working together

• Organismal level: The complete living being

Homeostasis

Homeostasis is the maintenance of a stable internal environment despite external changes.

• Importance: Essential for survival and proper function.

• Components: Receptor (detects change), Control center (processes information), Effector (responds to change).

• Feedback mechanisms: Negative feedback (reduces change), Positive feedback (amplifies change).

• Example: Regulation of body temperature.

Chapter 2: Chemical Basis of Life

Atomic Structure and Chemical Bonds

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

• Atomic number: Number of protons in an atom.

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

• Chemical bonds: Ionic, covalent, and hydrogen bonds.

• Ionic bond: Transfer of electrons between atoms (cation and anion).

• Covalent bond: Sharing of electrons (can be polar or nonpolar).

• Hydrogen bond: Weak attraction between polar molecules, important in DNA/RNA structure.

Water, Solutions, and pH

Water is vital for life due to its properties as a solvent and its role in chemical reactions.

• Solution: Homogeneous mixture of solute and solvent.

• Colloid: Mixture with larger particles that do not settle.

• Suspension: Mixture with visible particles that settle over time.

• pH: Measures hydrogen ion concentration; $pH = -\log[H^+]$

• Buffer: Substance that stabilizes pH.

Organic Molecules

Organic molecules are carbon-based and include carbohydrates, lipids, proteins, and nucleic acids.

• Macromolecule: Large complex molecule (polymer).

• Monomer: Building block of polymers.

• Carbohydrates: Monomers are monosaccharides; general formula is multiples of CH2O.

• Lipids: Fatty acids, triglycerides, phospholipids, steroids; hydrophobic.

• Proteins: Made of amino acids; functions include catalysis, structure, transport.

• Nucleic acids: DNA and RNA; store and transmit genetic information.

Enzymes and Chemical Reactions

Enzymes are biological catalysts that speed up chemical reactions without being consumed.

• Activation energy: Minimum energy required to start a reaction.

• Exergonic reaction: Releases energy.

• Endergonic reaction: Requires energy input.

• Specificity: Enzymes act on specific substrates.

• Example: DNA polymerase catalyzes DNA synthesis.

DNA vs. RNA

DNA and RNA are nucleic acids with distinct structures and functions.

• DNA: Double-stranded, stores genetic information.

• RNA: Single-stranded, involved in protein synthesis.

• Structural comparison: DNA contains deoxyribose; RNA contains ribose.

ATP Function

ATP (adenosine triphosphate) is the primary energy carrier in cells.

• ATP & ADP: ATP releases energy when converted to ADP ($ATP \rightarrow ADP + P_i + \text{energy}$).

Chapter 3: Cell Structure and Function

Plasma Membrane and Cell Components

The plasma membrane controls entry and exit of substances, maintaining cellular integrity.

• Fluid mosaic model: Describes membrane structure as a mosaic of proteins in a fluid lipid bilayer.

• Functions: Protection, communication, transport.

Cell Organelles

• Cytoskeleton: Provides structure, movement, and transport within cells.

• Ribosomes: Site of protein synthesis.

• Endoplasmic reticulum (ER): Rough ER synthesizes proteins; smooth ER synthesizes lipids.

• Golgi apparatus: Modifies, sorts, and packages proteins.

• Peroxisomes and lysosomes: Break down waste and cellular debris.

• Mitochondria: Produce ATP via cellular respiration.

Nucleus and Genetic Material

• Nucleus: Contains DNA, controls cell activities.

• Chromatin: DNA and associated proteins; condenses into chromosomes during cell division.

• Chromosomes: Humans have 46 (23 pairs); homologous chromosomes are pairs with similar genes.

• Haploid cells: Gametes (egg and sperm) have 23 chromosomes.

• Diploid cells: Somatic cells have 46 chromosomes.

Protein Synthesis

Protein synthesis involves transcription and translation.

• Transcription: DNA is copied into mRNA.

• Translation: mRNA is decoded by ribosomes to build proteins.

• Codon: Sequence of three mRNA bases coding for an amino acid.

• tRNA: Transfers amino acids to ribosome.

• rRNA: Component of ribosome.

Cell Cycle and Division

• Mitosis: Produces two identical daughter cells; essential for growth and repair.

• Meiosis: Produces four haploid gametes; essential for sexual reproduction.

Membrane Transport

• Selective permeability: Membranes allow certain substances to pass.

• Passive transport: Diffusion, osmosis, facilitated diffusion (no energy required).

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

• Osmosis: Movement of water across membrane.

• Isotonic, hypertonic, hypotonic solutions: Affect cell volume and water movement.

• Endocytosis and exocytosis: Vesicular transport mechanisms.

Chapter 4: Tissues

Types of Tissues

The human body is composed of four basic tissue types: epithelial, connective, muscle, and nervous tissue.

• Epithelial tissue: Covers surfaces, lines cavities, forms glands.

• Connective tissue: Supports, protects, binds other tissues.

• Muscle tissue: Produces movement.

• Nervous tissue: Transmits electrical impulses.

Characteristics of Epithelial Tissue

• Cells closely packed together

• Free (apical) surface

• Attached to underlying connective tissue by basement membrane

• Avascular (no blood vessels)

• Regeneration capability

Epithelial Tissue Structures

• Apical surface: Exposed to exterior or cavity

• Basal surface: Attached to other tissues

• Basement membrane: Connects epithelium to connective tissue

Gland Types

• Endocrine glands: Secrete hormones into bloodstream

• Exocrine glands: Secrete products into ducts

Connective Tissue Components

• Cells: Fibroblasts, adipocytes, macrophages, immune cells

• Extracellular matrix: Fibers (collagen, elastic, reticular), ground substance

Types of Connective Tissue

• Loose connective tissue: Adipose, areolar

• Dense connective tissue: Dense regular, dense irregular

• Supporting connective tissue: Cartilage (hyaline, elastic, fibrocartilage), bone

Chapter 5: Integumentary System

Functions of the Integumentary System

The integumentary system protects the body, regulates temperature, and synthesizes vitamin D.

• Protection from environmental hazards

• Excretion of salts, water, and wastes

• Temperature regulation

• Production of melanin and keratin

• Vitamin D synthesis

• Lipid storage

• Sensory detection

• Immune response coordination

Structure of the Skin

• Epidermis: Stratified squamous epithelium; main cells are keratinocytes

• Dermis: Connective tissue; contains blood vessels, nerves, glands

• Accessory structures: Hair follicles, sweat glands, sebaceous glands, nails

Epidermal Layers

• Stratum basale: Deepest layer; stem cells, active mitosis

• Stratum spinosum: Living keratinocytes

• Stratum granulosum: Keratin granules

• Stratum lucidum: Clear layer (only in thick skin)

• Stratum corneum: Superficial, dead cells filled with keratin

Skin Color and Pigmentation

• Melanin: Pigment produced by melanocytes; protects against UV radiation

• Carotene: Yellow-orange pigment from diet

• Blood flow: Influences skin color via papillary plexus

Dermis Structure

• Papillary layer: Areolar connective tissue, touch receptors

• Reticular layer: Dense irregular connective tissue, glands, blood vessels

Hair Follicles and Glands

• Hair follicle: Organ of hair growth; includes shaft, root, root hair plexus

• Sebaceous glands: Secrete sebum; lubricates hair and skin, antimicrobial properties

• Sudoriferous glands: Sweat glands; merocrine (watery sweat), apocrine (organic molecules)

Body Heat Regulation

• Insulation: Subcutaneous adipose tissue

• Vasoconstriction: Reduces heat loss

• Vasodilation: Increases heat loss

• Evaporative cooling: Sweat production

Table: Types of Chemical Bonds

Bond Type	Description	Example
Ionic	Transfer of electrons between atoms	NaCl (sodium chloride)
Covalent (polar/nonpolar)	Sharing of electrons; polar if unequal sharing	H2O (water), O2 (oxygen)
Hydrogen	Weak attraction between polar molecules	Between water molecules, DNA base pairs

Table: Layers of the Epidermis

Layer	Location	Key Features
Stratum basale	Deepest	Stem cells, mitosis, melanocytes
Stratum spinosum	Above basale	Keratinocytes, some mitosis
Stratum granulosum	Middle	Keratin granules, cell death begins
Stratum lucidum	Thick skin only	Clear, densely packed cells
Stratum corneum	Superficial	Dead, keratin-filled cells

Additional info:

• Some content inferred for completeness, such as the full list of tissue types and the details of protein synthesis.

• Tables reconstructed for clarity and study purposes.