Ch. 1: Introduction to Anatomy & Physiology

Levels of Complexity

The human body is organized into hierarchical levels, each increasing in complexity. Understanding these levels is fundamental to the study of anatomy and physiology.

• 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 & Survival Needs

Life functions are essential processes carried out by living organisms to maintain life. Survival needs are environmental factors required for these functions.

• Life Functions: Maintaining boundaries, movement, responsiveness, digestion, metabolism, excretion, reproduction, growth.

• Survival Needs: Nutrients, oxygen, water, normal body temperature, appropriate atmospheric pressure.

Directional Terminology, Body Planes, and Regions

Directional terms and body planes are used to describe locations and sections of the body. Body regions help identify anatomical landmarks.

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

• Body Planes: Sagittal, frontal (coronal), transverse (horizontal).

• Body Regions: Examples include abdominal, thoracic, pelvic, cranial.

Homeostasis

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

• Mechanisms: Negative feedback (reduces change), positive feedback (amplifies change).

• Example: Regulation of body temperature via sweating or shivering.

Ch. 2: Chemical Basis of Life

Energy Types & Atomic Structure

Energy is required for all physiological processes. Atoms are the basic units of matter, composed of subatomic particles.

• Energy Types: Chemical, electrical, mechanical, radiant.

• Atomic Structure: Protons (+), neutrons (0), electrons (-).

• Atomic Number: Number of protons in the nucleus.

• Atomic Mass: Sum of protons and neutrons.

Major Body Elements

The human body is primarily composed of a few key elements.

• Major Elements: Oxygen (O), Carbon (C), Hydrogen (H), Nitrogen (N).

• Minor Elements: Calcium (Ca), Phosphorus (P), Potassium (K), Sulfur (S), Sodium (Na), Chlorine (Cl), Magnesium (Mg), Iron (Fe).

Mixtures and Chemical Bonds

Mixtures are combinations of substances not chemically bonded. Chemical bonds hold atoms together in molecules.

• Mixtures: Solutions (homogeneous), colloids (heterogeneous, do not settle), suspensions (heterogeneous, particles settle).

• Chemical Bonds: Covalent (sharing electrons), ionic (transfer of electrons), hydrogen bonds (weak attractions).

Factors Influencing Chemical Reactions

Chemical reactions in the body are influenced by several factors.

• Heat: Increases reaction rate.

• Catalysts: Enzymes that speed up reactions.

• Concentration: Higher concentration increases reaction rate.

• pH: Affects enzyme activity and reaction rates.

Acids, Bases, and pH

Acids and bases are important for maintaining physiological pH balance.

• Acids: Release hydrogen ions ().

• Bases: Accept hydrogen ions or release hydroxide ions ().

• pH Scale: Measures hydrogen ion concentration; ranges from 0 (acidic) to 14 (basic), with 7 being neutral.

Formula:

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; includes microfilaments, microtubules, and intermediate filaments.

• Cilia & Microvilli: Cilia move substances; microvilli increase surface area for absorption.

• Chromosome & DNA: Carry genetic information.

• Nucleus: Contains DNA; controls cell activities.

• Nuclear Envelope & Nucleolus: Envelope surrounds nucleus; nucleolus produces ribosomes.

• Cytosol: Fluid portion of cytoplasm.

• Centrosome: Organizes microtubules.

• Basement Membrane: Supports epithelial tissue.

Cell Organelles

• Lysosome: Digests cellular waste.

• Endoplasmic Reticulum (ER): Smooth ER synthesizes lipids; Rough ER synthesizes proteins.

• Centriole: Involved in cell division.

• Mitochondrion: Produces ATP (energy).

• Ribosome: Synthesizes proteins.

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

• Peroxisome: Breaks down fatty acids and detoxifies.

Cell Cycle

The cell cycle consists of interphase and mitosis, leading to cell division.

• Interphase: Cell grows and DNA replicates.

• Mitosis: Division of nucleus; includes prophase, metaphase, anaphase, telophase.

• Cytokinesis: Division of cytoplasm.

Membrane Transport

Cells transport substances across membranes via various mechanisms.

• Exocytosis: Export of substances out of the cell.

• Endocytosis: Import of substances into the 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

Genetic information is copied and used to produce proteins.

• DNA Replication: Copying DNA before cell division.

• Transcription: DNA is transcribed into mRNA.

• Translation: mRNA is translated into protein.

Example: Synthesis of insulin in pancreatic cells.

Ch. 4: Tissues

Tissue Identification & Classification

Tissues are groups of cells with similar structure and function. They are classified into four main types.

• Epithelial Tissue: Covers surfaces; includes simple squamous, stratified squamous, simple cuboidal, pseudostratified columnar epithelium.

• Connective Tissue: Supports and binds; includes adipose, reticular, dense regular/irregular, elastic, hyaline cartilage, elastic cartilage, fibrocartilage, blood, compact bone.

• Muscle Tissue: Produces movement; includes skeletal, cardiac, smooth muscle.

• Nervous Tissue: Transmits electrical signals.

Tissue Functions, Descriptions, and Locations

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

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

• Locations: Epithelial tissue lines organs; connective tissue found throughout body; muscle tissue in muscles; nervous tissue in brain, spinal cord, nerves.

Tissue Classification Table

The following table summarizes the four main tissue types and their primary functions:

Additional info: Expanded explanations and examples were added for clarity and completeness based on standard Anatomy & Physiology curriculum.