In which Hank does some push-ups for science and describes the "economy" of cellular respiration and the various processes whereby our bodies create energy in the form of ATP.

Chapters:
1) Cellular Respiration
2) Adenosine Triphosphate
3) Glycolysis
A) Pyruvate Molecules
B) Anaerobic Respiration/Fermentation
C) Aerobic Respiration
4) Krebs Cycle
A) Acetyl COA
B) Oxaloacetic Acid
C) Biolography: Hans Krebs
D) NAD/FAD
5) Electron Transport Chain
6) Check the Math
Review

Hank and his cat Cameo help teach us about animal behavior and how we can discover why animals do the things they do.

Hank discusses the process by which organisms grow and develop, maintaining that, in the end, we're all just tubes.

Chapters:
1) Zygote
2) Morula
3) Blastula
4) Radial Symmetry
5) Bilateral Symmetry
6) Gastrulation
7) Blastopore
8) Gastrula
9) Protostomes & Deuterostomes
10) Germ Layers
a) Diploblastic
b) Triploblastic
11) Biolography

Hank tells us the story of the complicated chemical dance that allows our skeletal muscles to contract and relax.

Chapters:
1) Cardiac, Smooth, & Skeletal Muscles
2) Muscle Anatomy
a) Muscle Fibers
b) Myofibrils
c) Sarcomeres
d) Myofilaments
3) Biolography
4) Sliding Filament Model

Hank talks about the molecules that make up every living thing - carbohydrates, lipids, and proteins - and how we find them in our environment and in the food that we eat.

And thus begins the most revolutionary biology course in history. Come and learn about covalent, ionic, and hydrogen bonds. What about electron orbitals, the octet rule, and what does it all have to do with a madman named Gilbert Lewis? It's all contained within.

Chapters:
1. Intro
2. Carbon
3. Electron Shells
4. The Octet Rule
5. Gilbert Lewis
6. Covalent Bonds
7. Polar & Non-Polar Covalent Bonds
8. Ionic Bonds
9. Hydrogen Bonds
Review

Hank introduces us to ourselves by taking us on a journey through the fascinatingly diverse phyla known as chordata. And the next time someone asks you who you are, you can give them the facts: you're a mammalian amniotic tetrapodal sarcopterygian osteichthyen gnathostomal vertebrate cranial chordate.

Chapters:
1) Chordate Synapomorphies
2) Cephalachordata
3) Urochordata
4) Vertebrata
a) Myxini
b) Petromyzontida
c) Chondrichthyes
d) Osteichthyes
5) Biolography
6) Amphibia
7) Reptilia
8) Mammalia

Hank takes us on a trip around the body - we follow the circulatory and respiratory systems as they deliver oxygen and remove carbon dioxide from cells, and help make it possible for our bodies to function.

Chapters:
1) Respiratory System
2) Simple Diffusion
3) Respiratory Anatomy
a) Trachea to Capillaries
4) Lung Function & Thoracic Diaphragm
5) Circulatory System
6) Circulatory Anatomy
a) Left Ventricle to Capillary Beds
b) Veins to Left Atrium
7) Endotherms & Ectotherms

Hank introduces us to comparative anatomy, which studies the similarities and differences in animal anatomy to support the theory of evolution and the shared ancestry of living things.

Chapters:
1) Comparative Anatomy
2) Locomotion
3) Heterotophy
4) Convergent Evolution
5) Biolography
6) Tissues
a) Epithelial Tissue
b) Connective Tissue
c) Muscle Tissue
d) Nerve Tissue
7) Organs
8) Organ Systems
Review

Hank continues our exploration of animal phyla with the more complexly organized annelida and arthropoda, and a biolography on insects.

Hank imagines himself breaking into the Hot Pockets factory to steal their secret recipes and instruction manuals in order to help us understand how the processes known as DNA transcription and translation allow our cells to build proteins.

Chapters:
1) Transcription
A) Transcription Unit
B) Promoter
C) TATA Box
D) RNA Polymerase
E) mRNA
F) Termination signal
G) 5' Cap & Poly-A Tail
2) RNA Splicing
A) SNuRPs & Spliceosome
B) Exons & Introns
3) Translation
A) mRNA & tRNA
B) Triplet Codons & Anticodons
4) Folding & Protein Structure
A) Primary Structure
B) Secondary Structure
C) Tertiary Structure
D) Quaternary Structure

Hank introduces us to that wondrous molecule deoxyribonucleic acid - also known as DNA - and explains how it replicates itself in our cells.

Chapters:
1) Nucleic Acids
2) DNA
-A) Polymers
-B) Three Ingredients
-C) Base Pairs
-D) Base Sequences
3) Pop Quiz
4) RNA
-A) Three Differences from DNA
5) Biolography
6) Replication
-A) Helicase and Unzipping
-B) Leading Strand
-C) DNA Polymerase
-D) RNA Primase
-E) Lagging Strand
-F) Okazaki Fragments
-F) DNA Ligase
Review

Hank takes us through the bowels of the human digestive system and explains why it's all about surface area.

Chapters:
1) Surface Area to the Max!
2) Mouth to Esophagus
3) Stomach
4) Small Intestine
5) Large Intestine

Hank introduces us to ecology - the study of the rules of engagement for all of us earthlings - which seeks to explain why the world looks and acts the way it does. The world is crammed with things, both animate and not, that have been interacting with each other all the time, every day, since life on this planet began, and these interactions depend mostly on just two things... Learn what they are as Crash Course Biology takes its final voyage outside the body and into the entire world.

Chapters:
1) Ecological Hierarchy :2
a) Population
b) Community :1
c) Ecosystem
d) Biome :1
e) Biosphere

2) Key Ecological Factors
a) Temperature :1
b) Water

3) Biome Type :1

Hank tells us about the city of Eukaryopolis - the animal cell that is responsible for all the cool things that happen in our bodies.

Chapters:
1) Robert Hooke
2) Cilia/Flagella
3) Cell Membrane
4) Cytoplasm/Cytoskeleton/Centrosomes
5) Endoplasmic Reticulum
6) Ribosomes
7) Golgi Apparatus
8) Lysosomes
9) Nucleus
10) Mitochondria

Hank gets real with us in a discussion of evolution - it's a thing, not a debate. Gene distribution changes over time, across successive generations, to give rise to diversity at every level of biological organization.

Chapters:
1) The Theory of Evolution
2) Fossils
3) Homologous Structures
4) Biogeography
5) Direct Observation

Hank introduces us to the relatively new field of evolutionary developmental biology, which compares the developmental processes of different organisms to determine their ancestral relationship and to discover how those processes evolved. Also, fruit flies with eyes on their legs and chickens with teeth!

Chapters:
1) EVO/DEVO -
2) Developmental Regulatory Genes -
3) Gap Genes -
4) Homeobox / HOX Genes -
5) Messed-Up Experiment -
6) EVO/DEVO & Evolution -
a) Chickens with teeth -

Hank takes us on a fascinating journey through our excretory system to learn how our kidneys make pee.

Chapters:
1) Homeostasis & Osmoregulation
2) Urea & Uric Acid
3) Kidneys
4) Nephron
5) Glomerulus
6) Bowman's Capsule
7) Proximal Convoluted Tubule
8) Biolography
9) Loop of Henle
10) Distal Convoluted Tubule
11) Collecting Ducts
12) Ureters, Bladder & Urethra
Review

Death is what fungi are all about. By feasting on the deceased remains of almost all organisms on the planet, converting the organic matter back into soil from which new life will spring, they perform perhaps the most vital function in the global food web. Fungi, which thrive on death, make all life possible.

Chapters:
1) Biolography
2) Structure
3) The Decomposers
4) The Mutualists
5) The Predators
6) The Parasites
7) Reproduction

Hank fills us in on the endocrine system - the system of glands that produce and secrete different types of hormones directly into the bloodstream to regulate the body's growth, metabolism, and sexual development & function.

Chapters:
1) Signalling Systems :0
2) Pituitary :1
3) Hypothalamus :1
4) Thyroid :1
5) Adrenal :1
6) Pancreas :1
7) Biolography :2