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Which of the following systems is NOT part of the 13 systems of the human body?

  1. Digestive system

  2. Respiratory system

  3. Neurological system

  4. Integumentary system

The correct answer is: Neurological system

The neurological system is not recognized as one of the 13 major systems of the human body in traditional biological classifications. Instead, the functions often attributed to the neurological or nervous system are primarily encompassed within the nervous system, which includes the central and peripheral nervous systems. The other options listed – the digestive system, respiratory system, and integumentary system – are all established components of human anatomy. The digestive system is responsible for breaking down food and nutrient absorption; the respiratory system facilitates gas exchange and breathing; and the integumentary system, comprising skin and related structures, plays a key role in protection, regulation, and sensation. Understanding the classification of body systems is essential for various fields, including rehabilitation counseling, as different body systems often interplay in overall health and functionality. Recognizing the correct terminology and frameworks for these systems is crucial for effective communication and assessment in a healthcare or counseling context.