The term system or systems may be used in the following contexts:
System[]
- Autonomic nervous system
- Cardiovascular system
- Caste system
- Central nervous system
- Central nervous system disorders
- Central nervous system drugs
- Digestive system
- Endocrine system
- Extrapyramidal motor system
- Extrapyramidal system
- Gastrointestinal system
- Hypothalamo hypophyseal system
- Hypothalamo pituitary adrenal system
- Immune system
- Lemniscal system
- Limbic system
- Musculoskeletal system
- Nervous system
- Parasympathetic nervous system
- Peripheral nervous system
- Respiratory system
- Sclerosis (nervous system)
- Sensory system disorders
- Sympathetic nervous system
- Urogenital system
Systems[]
- Anatomical systems
- Classification systems
- Communication systems
- Decision support systems
- Expert systems
- Family systems theory
- Human machine systems
- Information systems
- Intelligent tutoring systems
- Knowledge based systems
- Number systems
- Political economic systems
- Telephone systems
- Systems analysis
- Systems design
- Systems theory