Unit 1 Exam Study Guide: Chapters 1-3 (Introduction to Anatomy & Physiology, Basic Chemistry, Cellular Respiration)

Unit 1 Exam Study Guide

Chapter 1: Introduction to Anatomy and Physiology

Definition and Scope

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

• Physiology: The study of the function of the body’s structural machinery.

• Homeostasis: The condition in which the body maintains a stable internal environment despite external changes.

Levels of Organization

• Chemical level (atoms, molecules)

• Cellular level (cells and their organelles)

• Tissue level (groups of similar cells)

• Organ level (contains two or more types of tissues)

• Organ system level (organs that work closely together)

• Organismal level (all organ systems combined)

Anatomic Terminology and Body Organization

• Directional terms (anterior, posterior, superior, inferior, etc.)

• Body planes and sections (sagittal, frontal, transverse)

• Body cavities (dorsal, ventral, thoracic, abdominopelvic)

• Serous membranes and their functions

• Abdominopelvic quadrants and regions

Homeostatic Mechanisms

• Negative feedback: Mechanisms that reduce the effect of the original stimulus (e.g., regulation of body temperature).

• Positive feedback: Mechanisms that enhance the original stimulus (e.g., blood clotting, labor contractions).

Chapter 2: Basic Chemistry

Basic Chemical Principles

• Matter: Anything that occupies space and has mass; exists as solids, liquids, or gases.

• Atoms: The smallest units of matter that retain the properties of an element.

• Subatomic particles: Protons (+), neutrons (0), electrons (-)

• Atomic number: Number of protons in an atom.

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

Chemical Bonds and Reactions

• Ionic bonds: Formed when electrons are transferred from one atom to another.

• Covalent bonds: Formed when atoms share electrons.

• Hydrogen bonds: Weak attractions between polar molecules.

• Electrolytes: Substances that dissociate into ions in solution and conduct electricity.

• Acids and bases: Acids release H+ ions; bases accept H+ ions.

• Buffers: Substances that minimize changes in pH.

Biological Macromolecules

• Carbohydrates: Sugars and starches; main energy source.

• Lipids: Fats, oils, and steroids; energy storage and membrane structure.

• Proteins: Made of amino acids; structural and functional roles.

• Nucleic acids: DNA and RNA; genetic information storage and transfer.

Water and Solutions

• Water as a solvent, its polarity, and its role in chemical reactions.

• Importance of pH and the maintenance of acid-base balance.

Chapter 3: Cellular Respiration

Energy and Metabolism

• Energy: The capacity to do work; exists as potential or kinetic energy.

• ATP (Adenosine Triphosphate): The main energy currency of the cell.

Cellular Respiration Pathways

• Glycolysis: Occurs in the cytoplasm; breaks down glucose into pyruvate, producing ATP and NADH.

• Krebs Cycle (Citric Acid Cycle): Occurs in the mitochondria; processes pyruvate to produce CO2, ATP, NADH, and FADH2.

• Electron Transport Chain: Uses NADH and FADH2 to generate a large amount of ATP; requires oxygen.

Anaerobic vs. Aerobic Respiration

• Aerobic respiration: Requires oxygen; produces more ATP.

• Anaerobic respiration: Occurs when oxygen is limited; produces less ATP and results in lactic acid formation.

Key Equations

• Overall equation for aerobic cellular respiration:

$\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{ATP}$

• ATP yield per glucose molecule (aerobic): ~36-38 ATP

Enzymes and Regulation

• Enzymes: Biological catalysts that speed up chemical reactions by lowering activation energy.

• Enzyme activity can be regulated by temperature, pH, and the presence of inhibitors or activators.

Sample Table: Types of Chemical Bonds

Bond Type	Description	Example
Ionic	Transfer of electrons from one atom to another	NaCl (table salt)
Covalent	Sharing of electrons between atoms	H2O (water)
Hydrogen	Weak attraction between polar molecules	Between water molecules

Key Learning Objectives

• Define and apply anatomical terminology.

• Describe the structure and function of body systems and their organization.

• Explain the chemical basis of life, including atomic structure, bonding, and macromolecules.

• Describe the processes of cellular respiration and energy production.

• Apply concepts of homeostasis and feedback mechanisms.