Exam 1 Review: Foundations of Anatomy & Physiology

Chapter 1 – An Introduction to Anatomy & Physiology

Overview of Anatomy and Physiology

Anatomy and physiology are foundational sciences in understanding the structure and function of the human body. Anatomy focuses on the physical structures, while physiology explores how those structures work.

• Anatomy: The study of body structure, including organs, tissues, and cells.

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

• Example: Anatomy describes the heart's chambers; physiology explains how the heart pumps blood.

Levels of Organization

The human body is organized into hierarchical levels, each building upon the previous.

• Cells → Tissues → Organs → Organ Systems → Organism

• Interrelation: Cells form tissues, tissues form organs, organs form organ systems, and organ systems make up the organism.

• Example: Muscle cells form muscle tissue, which is part of the muscular system.

Fields of Study in Anatomy & Physiology

Different branches focus on specific aspects of structure and function.

• Gross Anatomy: Study of structures visible to the naked eye.

• Microscopic Anatomy: Study of structures requiring magnification (e.g., cells).

• Developmental Anatomy: Study of structural changes throughout life.

• Systemic Anatomy: Study of body systems.

• Pathological Physiology: Study of disease effects on function.

Homeostasis

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

• Importance: Essential for survival and proper function.

• Example: Regulation of body temperature.

Regulation Mechanisms

Regulation can be intrinsic (autoregulation) or extrinsic, involving feedback systems.

• Autoregulation: Local automatic adjustment by a cell, tissue, or organ.

• Extrinsic Regulation: Regulation by nervous or endocrine systems.

• Feedback: Negative feedback reduces change; positive feedback amplifies it.

• Example: Blood glucose regulation (negative feedback); blood clotting (positive feedback).

Receptors, Control Centers, and Effectors

Homeostatic regulation involves three components:

• Receptor: Detects changes (e.g., thermoreceptor, mechanoreceptor).

• Control Center: Processes information and determines response.

• Effector: Carries out the response to restore balance.

Chapter 2 – The Chemical Level of Organization

Basic Chemical Concepts

Chemistry underlies all physiological processes. Understanding matter, atoms, and molecules is essential.

• Matter: Anything that has mass and occupies space.

• Elements: Pure substances made of one type of atom.

• Atoms: Smallest unit of an element, composed of protons, neutrons, and electrons.

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

• Ions: Atoms with a net charge due to loss or gain of electrons.

• Molecules: Two or more atoms bonded together.

Atomic Structure

• Protons: Positively charged, in nucleus.

• Neutrons: Neutral, in nucleus.

• Electrons: Negatively charged, orbit nucleus in shells.

• Electron Shells: Energy levels where electrons reside; each shell has a maximum capacity.

• Valence Electrons: Electrons in the outermost shell, important for chemical bonding.

Chemical Bonds

• Covalent Bonds: Atoms share electrons; can be polar (unequal sharing) or nonpolar (equal sharing).

• Ionic Bonds: Atoms transfer electrons, forming charged ions that attract each other.

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

Electronegativity

• Definition: The tendency of an atom to attract electrons in a bond.

• Application: Determines bond polarity and molecular interactions.

Chemical Reactions

• Reactants: Substances entering a reaction.

• Products: Substances produced.

• Catalysts: Speed up reactions without being consumed.

• Enzymes: Biological catalysts.

• General Equation:

$\text{Reactants} \rightarrow \text{Products}$

Macromolecules

Macromolecules are large, complex molecules essential for life.

• Carbohydrates: Energy source; monomer is monosaccharide.

• Lipids: Energy storage, insulation; monomer is fatty acid.

• Proteins: Structure, enzymes; monomer is amino acid.

• Polysaccharides: Complex carbohydrates (e.g., starch, glycogen).

Properties and Functions of Macromolecules

• Carbohydrates: Stored in liver and muscle (glycogen); found in plants (starch).

• Lipids: Hydrophobic; types include saturated and unsaturated fatty acids.

• Proteins: Made of amino acids; dipeptide (2 amino acids), polypeptide (many).

Chapter 3 – The Cellular Level of Organization

Cell Structure and Function

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

• Plasma Membrane: Controls entry/exit of substances; composed of phospholipid bilayer.

• Carrier-Mediated Transport: Uses proteins to move substances across membrane.

• Selective Permeability: Allows some substances to pass while restricting others.

Phospholipid Bilayer

• Phospholipids: Have hydrophilic heads and hydrophobic tails.

• Function: Forms barrier; allows fluidity and flexibility.

• Cholesterol: Stabilizes membrane.

Membrane Proteins

• Integral Proteins: Span the membrane; involved in transport.

• Peripheral Proteins: Attached to surface; involved in signaling.

Molecular Transport Mechanisms

• Simple Diffusion: Movement of molecules from high to low concentration without energy or carrier.

• Facilitated Diffusion: Movement via carrier proteins; no energy required.

• Active Transport: Movement against concentration gradient; requires energy (ATP) and carrier proteins.

• Exocytosis: Expulsion of materials from cell via vesicles.

• Endocytosis: Uptake of materials into cell via vesicles.

Energy and Transport

• ATP: Main energy currency for active transport.

• Enzymes: Aid in energy production and transport processes.

Summary Table: Types of Membrane Transport

Transport Type	Energy Required?	Carrier Protein?	Direction	Example
Simple Diffusion	No	No	High to Low	O2 movement
Facilitated Diffusion	No	Yes	High to Low	Glucose transport
Active Transport	Yes (ATP)	Yes	Low to High	Na+/K+ pump
Endocytosis	Yes	No	Into cell	Phagocytosis
Exocytosis	Yes	No	Out of cell	Neurotransmitter release

Additional info:

• Some content inferred for completeness, such as definitions and examples of key terms.

• Table entries expanded for clarity and academic context.