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Oral cavity and its extension which stretches through the body to the anus why not listed as an internal body cavity?
Wiki User
∙ 15y ago
It's because the oral cavity all the way to the anus is "open" to the external environment. Internal body cavities are those that are completely walled off from the external environment by well 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 waste to leave.
Wiki User
∙ 15y ago
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