Learn
Watch it happen.
Step-through animations of the processes students find hardest
Animations
Tour of the Cell · 6 parts
Muscle Contraction · 3 parts
The Neuron and the Synapse · 3 parts
One-part animations
Video lectures
The lectures the questions are matched to. Levels 0–6 are the system overviews; 7–10 go deeper. Open a system to see its lectures.
Cardiovascular System4 lectures
CardioVascular System
Levels 0–6
Blood Pressure
Levels 7–10
Heart Anatomy
Levels 7–10
Heart Electrical Activity
Levels 7–10
Respiratory System4 lectures
Respiratory System
Levels 0–6
Breathing Mechanics
Levels 7–10
Lung Capacities and Volumes
Levels 7–10
Lung Compliance Elasticity
Levels 7–10
Nervous System4 lectures
Neurological System
Levels 0–6
Brain Anatomy
Levels 7–10 · part of a playlist
Glial Cells
Levels 7–10 · part of a playlist
Neuron Anatomy and Function
Levels 7–10 · part of a playlist
Endocrine System10 lectures
Endocrine System
Levels 0–6
Aldosterone
Levels 7–10 · part of a playlist
Anterior Pituitary Gland
Levels 7–10 · part of a playlist
Antidiuretic Hormone
Levels 7–10 · part of a playlist
Cortisol
Levels 7–10 · part of a playlist
Endocrine System Receptor Pathways
Levels 7–10 · part of a playlist
Glucagon
Levels 7–10 · part of a playlist
Growth Hormone
Levels 7–10 · part of a playlist
Posterior Pituitary Gland
Levels 7–10 · part of a playlist
Thyroid Hormone
Levels 7–10 · part of a playlist
Digestive System1 lecture
Digestive System
Levels 0–6
Musculoskeletal System4 lectures
Muscular System
Levels 0–6
Skeletal System
Levels 0–6
Muscle
Levels 7–10
Neuromuscular Junction
Levels 7–10
Immune System3 lectures
Immune System
Levels 0–6
Adaptive Immune System
Levels 7–10 · part of a playlist
Inflammation Vascular Events
Levels 7–10 · part of a playlist
Reproductive System3 lectures
Reproductive System
Levels 0–6 · part of a playlist
Embryology
Levels 7–10 · part of a playlist
Reproductive System
Levels 7–10 · part of a playlist
Cell Biology6 lectures
Cell Structure Function
Levels 0–6
Meiosis Mitosis
Levels 0–6
Microorganisms Macromolecules
Levels 0–6
Bacteria
Levels 7–10 · part of a playlist
Cell Cycle
Levels 7–10
Cell Structure Function
Levels 7–10
Genetics & Molecular Biology3 lectures
Mendel
Levels 0–6
DNA Replication
Levels 7–10
DNA Structure
Levels 7–10
Biochemistry & Metabolism8 lectures
Carbohydrate Metabolism
Levels 7–10 · part of a playlist
Electron Transport Chain
Levels 7–10 · part of a playlist
Glycogen Metabolism
Levels 7–10 · part of a playlist
Glycolysis
Levels 7–10 · part of a playlist
Krebs Cycle
Levels 7–10 · part of a playlist
Lipid Metabolism
Levels 7–10 · part of a playlist
Protein Metabolism
Levels 7–10 · part of a playlist
Urea Cycle
Levels 7–10 · part of a playlist
General Chemistry6 lectures
Acid Base Reactions
Levels 0–6 · part of a playlist
Atoms Molecules
Levels 0–6 · part of a playlist
Chemical Reactions
Levels 0–6 · part of a playlist
Physical Properties States of Matter
Levels 0–6 · part of a playlist
Solutions Osmosis Diffusion
Levels 0–6 · part of a playlist
Acid Bases
Levels 7–10 · part of a playlist
Organic Chemistry2 lectures
Organic Chemistry Alcohols
Levels 7–10 · part of a playlist
Organic Chemistry Ether
Levels 7–10 · part of a playlist
Anatomy & Physiology (general)2 lectures
Anatomical Terms and directions
Levels 0–6
Integumentary System
Levels 0–6
Scientific Reasoning1 lecture
Scientific Reasoning
Levels 0–6 · part of a playlist
Numbers & Algebra1 lecture
Ratio and Proportion
Levels 0–6
Measurement & Data1 lecture
Dimensional Analysis
Levels 0–6
Then test yourself.
Every animation and lecture here has questions in the bank.