Khan Academy Static

2A: The human body is composed of about 100 trillion cells (this is not counting your bacterial buddies, who actually outnumber your cells 10 to 1!) Your cells must speak to each other to coordinate this massive symphony of life. In this tutorial, you will learn about the molecular basis of cellular signaling that makes this vast network speedy and efficient.

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14896_Cell_Junctions.html

14898_Ligand_Gated_Ion_Channels.html

14900_Enzyme_Linked_Receptors.html

14897_Membrane_Receptors.html