Human Anatomy and Physiology Chapter 1, 1.1 & 1.2

Anatomy and Physiology Defined & Levels of Organization in the Body

Anatomy

The science of structures and relationships between structures

Anatomy etymology

ana-=up -tomy=process of cutting

Physiology

The science of body functions, or how body parts work

Physiology etymology

Physio-=nature -logy-=study of

Number of levels of organization of the human body

six

Levels of organization of the human body

Chemical, cellular, tissue, organ, system, organismal

Chemical level is

Atoms and molecules

The cellular level is

Cells that are the basic structural and functional units of an organism

Cells are…

The smallest living units in the body

The tissue level is

Tissues that are groups of cells and material that work together to do a particular function

Four main types of tissue

Epithelial, connective, muscular, and nervous

The organ level is

things within the body that are composed of two or more different types of tissue

The system level is

A group of organs that have a common function

The organismal level is

All systems within the body combined to make up an organism