Final answer:
Mammalian bodies have both fluid compartments and body cavities that help maintain internal organization. The fluid compartments include the intracellular and extracellular fluid compartments, while the body cavities are divided into the dorsal and ventral cavities, protecting and allowing the function of organs.
Step-by-step explanation:
The human body contains various fluid compartments that help maintain its internal organization and protect vital organs. Two primary compartments found within the mammalian body are the intracellular fluid compartment and the extracellular fluid compartment. The intracellular fluid compartment includes the fluid inside all cells of the body, constituting a system that is largely segregated from other systems. The extracellular fluid compartment encompasses the interstitial fluid that bathes the cells, as well as the blood that circulates in a closed circulatory system, which is unidirectional from the heart through the body and back to the heart again.
The human body also has major body cavities that serve as another level of compartmentalization. These include the dorsal cavity, which contains the cranial and spinal cavities, and the ventral cavity, which houses the thoracic and abdominopelvic cavities. These cavities are crucial for protecting internal organs and allowing for changes in their size and shape during functioning.