What term describes the psychological and physiological operations of body systems as outlined by WHO?

The correct term that describes the psychological and physiological operations of body systems, as outlined by the World Health Organization (WHO), is "body functions." This term encapsulates various physiological and psychological aspects that influence health and performance in daily activities. Specifically, "body functions" refer to the basic physical and mental functions of the body's systems, encompassing a wide range of elements such as sensory functions, movement, and cognitive processes.

The Occupational Therapy Practice Framework, 4th Edition (OTPF-4), categorizes body functions as intrinsic elements that directly affect a person's ability to engage in activities. This term aligns closely with how the WHO defines these operations, emphasizing the importance of understanding the biological and mental components that underlie human performance.

In contrast, cognitive functions refer specifically to mental processes like thinking, memory, and decision-making, and do not encompass the full range of physiological processes. Client factors include not just body functions, but also values, beliefs, and spirituality that affect engagement in occupations. Environmental factors refer to the physical, social, and attitudinal environments that can facilitate or hinder a person's participation in activities. These terms serve different purposes in the occupational therapy framework and thus help to clarify the concept of body functions distinctly.