Khan Academy on a Stick
Human biology
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The lungs and pulmonary system
The pulmonary system including the lungs, larynx, trachea, bronchi, bronchioles, alveoli and thoracic diaphragm
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Red blood cells
Oxygen uptake by hemoglobin in red blood cells
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Circulatory system and the heart
Introduction to the circulatory system and the heart
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Hemoglobin
Hemoglobin and its role in the circulatory system
Circulatory and pulmonary systems
As humans, we really like breathing oxygen. That's because the cells in our body will die if they don't get oxygen to function in a reasonable amount of time. This tutorials describes how we use the lungs to exchange gasses between our blood and the atmosphere and how the oxygen is then pumped through the body by way of blood and the circulatory system.
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Anatomy of a neuron
Introduction to the neuron and its anatomy
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Sodium potassium pump
How a sodium potassium pump can maintain a voltage gradient across a cell or neuron's membrane
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Correction to sodium and potassium pump video
Correction to Sodium and Potassium Pump Video
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Electrotonic and action potential
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Saltatory conduction in neurons
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Neuronal synapses (chemical)
How one neuron can stimulate (or inhibit) another neuron at a chemical synapse
The neuron and nervous system
Neurons are the primary way that our bodies transmit signals from one part to another quickly. In this tutorial, we'll explore the anatomy of a neuron and the mechanism by which a signal is actually transmitted through one.
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The kidney and nephron
Overview of how the nephrons in the kidney filter blood and reabsorb water and other molecules.
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Secondary active transport in the nephron
Secondary Active Transport in the Nephron
The kidney and nephron
How do we get unwanted substances out of our blood? Through the kidney. This tutorial goes into some detail to describe just how this happens.
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Myosin and actin
How myosin and actin interact to produce mechanical force.
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Tropomyosin and troponin and their role in regulating muscle contraction
Tropomyosin and troponin and their role in regulating muscle contraction. How calcium ion concentration dictates whether a muscle is contracting or not.
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Role of the sarcoplasmic reticulum in muscle cells
The role of the sarcoplasmic reticulum in controlling calcium ion concentrations within the muscle cell.
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Anatomy of a skeletal muscle fiber
Understanding the structure of a muscle fiber
Muscles
Without muscles, we wouldn't be able to do much of anything. This tutorial begins to explore what muscle cells are and how they contract in order to move our bodies (or do things like breath and pump blood).