Читать книгу Understanding Anatomy and Physiology in Nursing - John Knight - Страница 60

For each physiological variable there is an optimal value termed the ‘set point’.

For example, the set point for blood glucose is around 5 mmol/l. At this optimal concentration cells throughout the body will have a steady supply of glucose, allowing them to undertake efficient cellular metabolism. The body attempts to maintain each variable as close to its set point as possible by a process called negative feedback. During negative feedback deviations from the set point are minimised and resisted to constrain the variable within its ‘normal range’.