| Anatomy | science of body structures and the relationships among them. |
| Physiology | science of body functions—how the body parts work. |
| Embryology | first eight weeks of development after fertilization of a human egg |
| Developmental biology | complete development of an individual from fertilization to death. |
| Cell biology | Cellular structure and functions. |
| Histology | Microscopic structure of tissues. |
| Gross anatomy | Structures that can be examined without a microscope. |
| Systemic anatomy | Structure of specific systems of the body such as the nervous or respiratory systems. |
| Regional anatomy | Specific regions of the body such as the head or chest. |
| Surface anatomy | Surface markings of the body to understand internal anatomy through visualization and palpation (gentle touch). |
| Imaging anatomy | Body structures that can be visualized with techniques such as x-rays, MRI, and CT scans. |
| Pathological anatomy | Structural changes associated with disease. |
| Neurophysiology | Functional properties of nerve cells. |
| Endocrinology | Hormones (chemical regulators in the blood) and how they control body functions. |
| Cardiovascular physiology | Functions of the heart and blood vessels. |
| Immunology | The body’s defenses against disease-causing agents. |
| Respiratory physiology | Functions of the air passageways and lungs. |
| Renal physiology | Functions of the kidneys. |
| Exercise physiology | Changes in cell and organ functions due to muscular activity. |
| Pathophysiology | Functional changes associated with disease and aging. |
| Chemical Level | very basic level, can be compared to the letters of the alphabet, includes atoms, the smallest units of matter that participate in chemical reactions, and molecules, two or more atoms joined together. |
| atoms | smallest units of matter |
| molecules | two or more atoms joined together |
| Certain atoms essential for maintaining life. | CHONPCaS |
| Cellular level | Molecules combine to form cells |
| Cells | smallest living units in the human body |
| Tissue level | Tissues are groups of cells and the materials surrounding them that work together to perform a particular function |
| 4 Types of Tissues | Epithelial, Connective, Muscular, Nervous |
| Organ level | different types of tissues are joined together. |
| Organs | structures that are composed of two or more different types of tissues; they have specific functions and usually have recognizable shapes |
| System Level | Consists of related organs. |
