Body Cavities
1 Body Cavities 1.1 Definitions, Overview, and Evolution of Body Cavities Definitions The human body, similar to all higher organisms, is organized into a hierarchy of different levels: • A…
Autonomic Nervous System
10 Autonomic Nervous System 10.1 The Sympathetic and Parasympathetic Nervous Systems The autonomic, or visceral, nervous system innervates the internal organs. It is divided into three parts: the sympathetic, parasympathetic,…
Endocrine System
9 Endocrine System 9.1 Overview of the Endocrine System A The endocrine system By secreting hormones, the endocrine system enables cells to communicate with other cells and coordinates bodily functions….
Lymphatic System
4 Lymphatic System 4.1 Overview of the Lymphatic System A Lymphatic organs and vessels The lymphatic system, which is widely distributed throughout most of the body, consists of lymphatic organs…
