The digestive canal represents a tube passing through the entire organism and communicating with the external world, i.e. as it were the… — Ivan Pavlov Copy Share Image
The digestive canal is in its task a complete chemical factory. The raw material passes through a long series of institutions in… — Ivan Pavlov Copy Share Image
Finally, as the digestive canal is a complex system, a series of separate chemical laboratories, I cut the connections between them in… — Ivan Pavlov Copy Share Image
