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Anatomy
The study of the structure and relationship between body parts.
Physiology
The study of the function of body parts and the body as a whole.
Atoms
Atoms, molecules (combinations of atoms) and the chemical bonds between atoms provide the framework upon which all living activity is based. Building blocks of life.
Cells
The smallest unit of life. Cells themselves may be specialized such as nerve cells, bone cells, muscle cells etc.
Organelles
Specialized bodies within the cell that perform specific cellular functions. They include nucleus, mitochondria etc.
Tissue
A group of similar cells performing a common function. Muscle tissue, for example consists of muscle cells.
Organ
A group of different kinds of tissues working together to perform a particular activity. For example: the heart is an organ composed of muscle, nervous, connective and epithelial tissues.
Organ System
Two or more organs working together to accomplish a particular task. For example: The digestive system involves the coordinated activities of many organs including the mouth, stomach, small and large
Organism
A system possessing the characteristics of living things-ability to obtain and process energy, ability to respond to environmental changes and ability to reproduce.