Anatomy and physiology of all 12 body systems

Human anatomy is the scientific study of the body’s structures. Some of these structures are very small and can only be observed and analyzed with the assistance of a microscope. Other larger structures can readily be seen, manipulated, measured, and weighed. The word “anatomy” comes from a Greek root that means “to cut apart.” Human anatomy was first studied by observing the exterior of the body and observing the wounds of soldiers and other injuries. Later, physicians were allowed to dissect bodies of the dead to augment their knowledge. When a body is dissected, its structures are cut apart in order to observe their physical attributes and their relationships to one another. Dissection is still used in medical schools, anatomy courses, and in pathology labs. In order to observe structures in living people, however, a number of imaging techniques have been developed. These techniques allow clinicians to visualize structures inside the living body such as a cancerous tumor or a fractured bone.

Anatomy and physiology of all 12 body systems

12 units: cells and tissues, integumentary, skeleton and joints, muscle types, nervous, endocrine, circulatory, lymphatic, respiratory, digestive, urinary, and reproductive

What Is Anatomy and Physiology?

Anatomy is the study of the structure and relationship between body parts.

Physiology is the study of the function of body parts and the body as a whole. Some specializations within each of these sciences follow:

Gross (macroscopic) anatomy is the study of body parts visible to the naked eye, such as the heart or bones.

Histology is the study of tissues at the microscopic level.

Cytology is the study of cells at the microscopic level.

Neurophysiology is the study of how the nervous system functions.

Organizations of living systems

Living systems can be defined from various perspectives, from the broad (looking at the entire earth) to the minute (individual atoms). Each perspective provides information about how or why a living system functions:

At the chemical level, atoms, molecules (combinations of atoms), and the chemical bonds between atoms provide the framework upon which all living activity is based.

The cell is the smallest unit of life. Organelles within the cell are specialized bodies performing specific cellular functions. Cells themselves may be specialized. Thus, there are nerve cells, bone cells, and muscle cells.

A tissue is a group of similar cells performing a common function. Muscle tissue, for example, consists of muscle cells.

An organ is a group of different kinds of tissues working together to perform a particular activity. The heart is an organ composed of muscle, nervous, connective, and epithelial tissues.

An organ system is two or more organs working together to accomplish a particular task. The digestive system, for example, involves the coordinated activities of many organs, including the mouth, stomach, small and large intestines, pancreas, and liver.

An organism is a system possessing the characteristics of living things—the ability to obtain and process energy, the ability to respond to environmental changes, and the ability to reproduce.

New Systems Overview section featuring brand-new, full-body views of surface anatomy, vessels, nerves, and lymphatics.

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