Biology - in-depth

Study living organisms from their morphology, physiology, anatomy, behaviour, origin to their distribution. Whether you want to know more about humans or plants this is the right place for you. Created by Khan Academy.

Average Course Length

20 hours

Skill Level


Pick a lesson

1: Introduction to Evolution and Natural Selection
2: Ape Clarification
3: Intelligent Design and Evolution
4: Evolution Clarification
5: Natural Selection and the Owl Butterfly
6: DNA
7: Variation in a Species
8: Chromosomes, Chromatids, Chromatin, etc.
9: Mitosis, Meiosis and Sexual Reproduction
10: Phases of Mitosis
11: Phases of Meiosis
12: Embryonic Stem Cells
13: Cancer
14: Introduction to Heredity
15: Punnett Square Fun
16: Hardy-Weinberg Principle
17: Sex-Linked Traits
18: Bacteria
19: Viruses
20: ATP: Adenosine Triphosphate
21: Introduction to Cellular Respiration
22: Oxidation and Reduction Review From Biological Point-of-View
23: Oxidation and Reduction in Cellular Respiration
24: Glycolysis
25: Krebs / Citric Acid Cycle
26: Electron Transport Chain
27: Oxidative Phosphorylation and Chemiosmosis
28: Photosynthesis
29: Photosynthesis: Light Reactions 1
30: Photosynthesis: Light Reactions and Photophosphorylation
31: Photosynthesis: Calvin Cycle
32: Photorespiration
33: C-4 Photosynthesis
34: CAM Plants
35: Parts of a cell
36: Diffusion and Osmosis
37: The Lungs and Pulmonary System
38: Red blood cells
39: Circulatory System and the Heart
40: Hemoglobin
41: Anatomy of a Neuron
42: Sodium Potassium Pump
43: Correction to Sodium and Potassium Pump Video
44: Electrotonic and Action Potentials
45: Private video
46: Neuronal Synapses (Chemical)
47: Myosin and Actin
48: Tropomyosin and troponin and their role in regulating muscle contraction
49: Role of the Sarcoplasmic Reticulum in Muscle Cells
50: Anatomy of a muscle cell
51: Role of Phagocytes in Innate or Nonspecific Immunity
52: Types of immune responses: Innate and Adaptive. Humoral vs. Cell-Mediated
53: B Lymphocytes (B cells)
54: Professional Antigen Presenting Cells (APC) and MHC II complexes
55: Helper T Cells
56: Cytotoxic T Cells
57: Review of B cells, CD4+ T cells and CD8+ T cells
58: Inflammatory Response
59: The Kidney and Nephron
60: Secondary Active Transport in the Nephron
61: Species
62: Taxonomy and the Tree of Life