as an internal body cavity. Why is this so?
Quite frankly it's because the oral cavity all the style to the anus is "open" to the environment. While it does internally traverse the length of the belly, the GI tract is still considered to be external since it is open at both ends to the external environment.
Internal body cavity are those that are completely walled off from the external environment by in good health defined structures such as skin, mysentary, etc. In contrast the GI tract is specifically designed to periodically open to the external environment an allow food to enter and excess to leave.
Is the hole contained by the middle of a donut an internal surface or an external surface? Goes the same for your mouth/butt babe. depends how you look at it.
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