8. What are the primary body cavities and what structures are in each one?
The primary body cavities are the:
cranial—skull, containing the brain
spinal—spinal column, containing the spinal cord
thoracic cavity—chest, containing the heart, lungs, and major blood vessels, and separated from the abdominal cavity by the diaphragm
abdominal cavity—in the abdomen, containing the stomach, intestines, liver, gallbladder, pancreas, and spleen
pelvic cavity—in the lower abdomen, containing the urinary bladder, rectum, and reproductive organs