The document summarizes the nine levels of organization of the human body from chemical to organism. It describes that the body can be divided into an axial portion including the head, neck and trunk, and an appendicular portion including the upper and lower limbs. The main body cavities are the dorsal cavity including the cranial and spinal cavities, and the ventral cavity including the thoracic cavity containing lungs and heart, and the abdominopelvic cavity containing organs of the abdomen and pelvis.

1. Human Organization Chapter 1: Introduction to Human A&P Unit 1: Levels of Organization

14. Sagittal Section

15. Coronal Section

16. Transverse Section