BIO 109: Study Guide for Exam 1 – Introduction to Anatomy, Physiology, and Chemistry of Life

Study Guide - Smart Notes

Tailored notes based on your materials, expanded with key definitions, examples, and context.

Chapter 1: Introduction to Anatomy and Physiology

Anatomical Terminology

Understanding anatomical terminology is essential for accurately describing the locations and relationships of body structures.

Directional Terms: Terms such as superior (above), inferior (below), anterior (front), posterior (back), medial (toward the midline), and lateral (away from the midline) are used to describe positions relative to other structures.
Anatomical Position: The standard reference position in which the body stands upright, facing forward, with arms at the sides and palms facing forward.

Organ Systems Overview

The human body is organized into several organ systems, each with specific functions and components.

Skeletal System: Provides support, protection, and aids in movement.
Muscular System: Responsible for movement and heat production.
Endocrine System: Regulates body functions through hormones; includes glands such as the pancreas.
Respiratory System: Facilitates gas exchange (oxygen and carbon dioxide) with the environment.
Pancreas: Functions in both the digestive system (producing digestive enzymes) and the endocrine system (secreting insulin and glucagon).

Body Cavities

Body cavities protect internal organs and allow for changes in organ shape and size.

Dorsal Cavity: Includes the cranial cavity (houses the brain) and vertebral cavity (encloses the spinal cord).
Ventral Cavity: Subdivided into the thoracic cavity (contains heart and lungs) and abdominopelvic cavity (contains digestive, urinary, and reproductive organs).

Homeostasis and Feedback Loops

Homeostasis is the maintenance of a stable internal environment. The body uses feedback mechanisms to regulate physiological processes.

Negative Feedback: The response reduces or eliminates the original stimulus (e.g., body temperature regulation).
Positive Feedback: The response enhances the original stimulus (e.g., blood clotting, labor contractions).

Gradients in Physiology

Gradients are differences in concentration, pressure, or electrical charge between two regions, driving physiological processes.

Concentration Gradient: Difference in the amount of a substance across a space (e.g., ions across a membrane).
Pressure Gradient: Drives movement of fluids (e.g., blood flow from high to low pressure).

Serous Membranes

Serous membranes line body cavities and cover organs, reducing friction.

Parietal Layer: Lines the cavity walls.
Visceral Layer: Covers the organs within the cavity.
Examples: Pleura (lungs), pericardium (heart), peritoneum (abdominal organs).

Labeling Diagrams

Accurate labeling of anatomical diagrams is crucial for visualizing and understanding body structures and their relationships.

Chapter 2: The Chemistry of Life

Atomic Structure

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

Atomic Number: Number of protons in the nucleus; defines the element.
Neutrons: Neutral particles in the nucleus; contribute to atomic mass.
Electrons: Negatively charged particles orbiting the nucleus.

Chemical Bonds

Chemical bonds form when atoms interact to achieve stability.

Ionic Bonds: Formed by the transfer of electrons from one atom to another, resulting in charged ions (e.g., NaCl).
Covalent Bonds: Formed by the sharing of electrons between atoms (e.g., H2O).

Chemical Reactions

Chemical reactions involve the making or breaking of bonds, transforming reactants into products.

Catabolic Reactions: Break down molecules and release energy (e.g., cellular respiration).
Anabolic Reactions: Build complex molecules from simpler ones, consuming energy (e.g., protein synthesis).
Reactants and Products: Reactants are substances that start a reaction; products are formed as a result.

Factors Affecting Reaction Rates

Temperature: Higher temperatures generally increase reaction rates.
Concentration: Higher concentrations of reactants increase the likelihood of collisions and reactions.
Catalysts: Substances that speed up reactions without being consumed (e.g., enzymes).

pH and Solutions

The pH scale measures hydrogen ion concentration in a solution.

pH Scale: Ranges from 0 (acidic) to 14 (basic); 7 is neutral.
Interpretation: Lower pH = higher H+ concentration; higher pH = lower H+ concentration.

Biological Macromolecules

Macromolecules are large, complex molecules essential for life.

Carbohydrates: Provide energy; building blocks are monosaccharides (e.g., glucose).
Lipids: Store energy, form cell membranes; include fats, oils, and steroids.
Proteins: Perform structural, enzymatic, and regulatory functions; made of amino acids.
Nucleic Acids: Store and transmit genetic information; DNA and RNA.

Dehydration Synthesis and Disaccharide Formation

Dehydration Synthesis: Joins two molecules by removing a water molecule.
Disaccharide Formation: Two monosaccharides combine to form a disaccharide (e.g., glucose + fructose = sucrose).

Lipids and Fatty Acids

Saturated Fatty Acids: No double bonds; solid at room temperature (e.g., butter).
Unsaturated Fatty Acids: One or more double bonds; liquid at room temperature (e.g., olive oil).

Chapter 3: The Cell

Functions of the Plasma Membrane

The plasma membrane controls the movement of substances into and out of the cell and facilitates communication and structural support.

Communication: Contains receptors for signaling molecules.
Support: Maintains cell shape and anchors the cytoskeleton.
Isolation: Separates the cell's internal environment from the external environment.

Cytosol and Intracellular Fluids

Cytosol is the fluid portion of the cytoplasm, containing dissolved substances and organelles.

Cytosol: Site of many metabolic reactions.
Intracellular Fluid: All fluid within the cell, including cytosol and organelle contents.

Structure of the Plasma Membrane

The plasma membrane is primarily composed of a phospholipid bilayer with embedded proteins and cholesterol.

Phospholipid Bilayer: Provides a semi-permeable barrier.
Cholesterol: Stabilizes membrane fluidity.

Diffusion and Osmosis

These are passive transport mechanisms that move substances across membranes.

Simple Diffusion: Movement of small, nonpolar molecules down their concentration gradient.
Facilitated Diffusion: Movement of larger or polar molecules via membrane proteins.
Osmosis: Diffusion of water across a selectively permeable membrane.

Cell Solutions: Tonicity

Isotonic: Equal solute concentration inside and outside the cell; no net water movement.
Hypotonic: Lower solute concentration outside; water enters the cell, which may swell.
Hypertonic: Higher solute concentration outside; water leaves the cell, which may shrink.

Cellular Organelles

Organelles perform specialized functions within the cell.

Mitochondria: Site of ATP (energy) production.
Golgi Apparatus: Modifies, sorts, and packages proteins and lipids.
Endoplasmic Reticulum (ER): Rough ER synthesizes proteins; smooth ER synthesizes lipids and detoxifies chemicals.
Peroxisomes: Break down fatty acids and detoxify harmful substances.
Ribosomes: Synthesize proteins.

Endomembrane System

The endomembrane system is a network of membranes involved in transport and processing of cellular materials.

Includes: Nuclear envelope, endoplasmic reticulum, Golgi apparatus, lysosomes, vesicles, and plasma membrane.

Genetics: DNA Structure and Protein Synthesis

DNA contains genetic instructions for protein synthesis.

Genes: Segments of DNA that code for specific proteins.
Triplet Code: Sequence of three DNA bases that specifies an amino acid.

Homologous Chromosomes

Human Cells: Contain 23 pairs of homologous chromosomes (46 total).
Significance: Homologous pairs carry genes for the same traits; important for inheritance.

Protein Synthesis

mRNA (messenger RNA): Carries genetic code from DNA to ribosomes.
tRNA (transfer RNA): Brings amino acids to the ribosome during translation.
Codons and Anticodons: Codons are three-base sequences on mRNA; anticodons are complementary sequences on tRNA.

Study Strategies

Concept Mapping: Create diagrams to link related concepts.
Practice Questions: Test your understanding with sample questions.
Group Study: Discuss and explain topics with peers.
Flashcards: Use for memorizing definitions and key facts.
Regular Review: Space out study sessions for better retention.
Utilize Resources: Supplement learning with textbooks, videos, and online materials.

Additional info: For equations such as the calculation of pH, use the formula:

pH calculation: