Foundations of Anatomy & Physiology: Study Guide and Key Concepts

Chapter 1: Introduction to Anatomy & Physiology

Definitions and Scope

Anatomy and physiology are foundational sciences in understanding the structure and function of the human body. This section introduces key distinctions and organizational principles.

• Anatomy: The study of the structure of body parts and their relationships to one another.

• Physiology: The study of the function of body parts and how they work to carry out life-sustaining activities.

• Subfields of Human Biology: Includes gross anatomy, microscopic anatomy, developmental biology, and more.

Levels of Organization

The human body is organized into hierarchical levels, each with specific roles.

• Levels: Chemical → Cellular → Tissue → Organ → Organ System → Organism

• 11 Organ Systems: Examples include the integumentary, skeletal, muscular, nervous, endocrine, cardiovascular, lymphatic, respiratory, digestive, urinary, and reproductive systems.

Anatomical Terminology

Precise anatomical terms are used to describe body regions, positions, and sections.

• Body Cavities: Dorsal (cranial, vertebral) and ventral (thoracic, abdominopelvic) cavities.

• Abdominopelvic Regions: Nine regions (e.g., epigastric, umbilical, hypogastric, etc.)

• Serous Membranes: Pleura (lungs), Pericardium (heart), Peritoneum (abdominal organs).

• Retroperitoneal Organs: Organs located behind the peritoneum, such as kidneys.

Homeostasis and Feedback Mechanisms

Homeostasis is the maintenance of a stable internal environment. Feedback loops regulate physiological processes.

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

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

• Homeostatic Regulatory Mechanism: Consists of receptor, control center, and effector.

Chapter 2: Chemical Foundations of Life

Atoms, Elements, Molecules, and Compounds

Understanding the chemical basis of life is essential for studying physiology.

• Atom: The smallest unit of an element, composed of protons, neutrons, and electrons.

• Element: A pure substance consisting of one type of atom.

• Molecule: Two or more atoms bonded together.

• Compound: A substance formed from two or more different elements.

Subatomic Particles

• Proton: Positive charge, found in nucleus.

• Neutron: No charge, found in nucleus.

• Electron: Negative charge, orbits nucleus.

Isotopes

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

Chemical Bonds

• Covalent Bonds: Sharing of electron pairs between atoms. Can be polar (unequal sharing) or nonpolar (equal sharing).

• Ionic Bonds: Transfer of electrons from one atom to another, resulting in charged ions.

• Hydrogen Bonds: Weak attractions between a hydrogen atom and an electronegative atom.

Properties of Water

• Special Properties: High heat capacity, solvent abilities, cohesion, adhesion.

• pH: Measure of hydrogen ion concentration. $\text{pH} = -\log_{10}[\text{H}^+]$

Metabolism and Chemical Reactions

• Metabolism: All chemical reactions in the body.

• Anabolism: Building complex molecules from simpler ones.

• Catabolism: Breaking down complex molecules into simpler ones.

• Condensation (Dehydration Synthesis): Reaction forming a covalent bond with the removal of water.

• Hydrolysis: Breaking a bond by adding water.

Kinetic vs. Potential Energy

• Kinetic Energy: Energy of motion.

• Potential Energy: Stored energy due to position or structure.

Enzymes

• Enzyme: Biological catalyst that speeds up chemical reactions by lowering activation energy.

• Operation: Enzymes bind substrates at the active site, forming an enzyme-substrate complex.

Biological Macromolecules

Classification and Functions

Biological macromolecules are essential for structure and function in living organisms. They include carbohydrates, nucleic acids, proteins, and lipids.

Biomacromolecule	Monomers (atom composition)	Polymers	Functions
Carbohydrates	Monosaccharides (C, H, O)	Cellulose, Starch, Glycogen	Energy storage, structural support
Nucleic Acids	Nucleotides (RNA, DNA)	RNA, DNA	Genetic information storage and transfer
Proteins	Amino acids	Polypeptides	Movement, speeding up reactions (enzymes), structural support
Lipids	Fatty acids, glycerol	Triglycerides, phospholipids, steroids	Energy storage, membrane structure, signaling

Amino acids undergo dehydration reactions to form peptide bonds.

Chapter 3 Cell Structure and Function

Organization of DNA in the Cell

• DNA: Organized into chromosomes within the nucleus.

Lipids: Saturated vs. Unsaturated

• Saturated Lipids: No double bonds, solid at room temperature.

• Unsaturated Lipids: One or more double bonds, liquid at room temperature.

Plasma Membrane Structure

• Phospholipid Bilayer: Hydrophilic heads, hydrophobic tails.

• Integral Proteins: Span the membrane.

• Peripheral Proteins: Attached to the surface.

Glycocalyx

• Structure: Carbohydrate-rich area on the cell surface.

• Function: Cell recognition, protection.

Cell Organelles and Functions

• Nucleus: Contains genetic material.

• Mitochondria: ATP production.

• Endoplasmic Reticulum: Protein and lipid synthesis.

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

• Lysosomes: Digestion of cellular waste.

• Ribosomes: Protein synthesis.

Genetic Information Flow

• Central Dogma: DNA → RNA → Protein

Enzymes in DNA Replication

• Helicase: Unwinds DNA.

• DNA Polymerase: Synthesizes new DNA strands.

• Ligase: Joins DNA fragments.

Membrane Transport

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

• Active Transport: Requires energy (e.g., sodium-potassium pump).

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

• Vesicular Transport: Movement via vesicles (e.g., endocytosis, exocytosis).

Cell Cycle and Regulation

• Stages: G1 (growth), S (DNA synthesis), G2 (preparation), M (mitosis).

• Regulation: Controlled by cyclins and checkpoints.

• Unregulated Cell Division: Can lead to cancer.

Additional info: Some explanations and table entries have been expanded for completeness and clarity.