Changes

==Introduction==

==Introduction==

[[File:Anatomy and physiology of animals A reflex arc.jpg|200px|right|Reflex arc]]

[[File:Anatomy and physiology of animals A reflex arc.jpg|400px|right|Reflex arc]]

A reflex arc represents a mechanism by which a physiological function is automatically managed or regulated. Reflex arcs can be found throughout the body, ranging from [[Muscles - Anatomy & Physiology#Skeletal Muscle|skeletal muscles]] to [[Muscles - Anatomy & Physiology#Smooth Muscle|smooth muscle]] in glands. Reflex arcs are initiated via the excitation or stimulation of specific sensory cells that are directly connected to motor neurons thus enabling [[Spinal Cord - Anatomy & Physiology#Upper and Lower Motor Neurons|motor nerve]] impulses to be automatically passed on to that particular muscle or gland. Therefore a basic reflex arc consists of '''sensory cells''' and their associated nerve fibers, '''motor nerve fibres''' and the ultimate '''muscle or gland'''.

A reflex arc represents a mechanism by which a physiological function is automatically managed or regulated. Reflex arcs can be found throughout the body, ranging from [[Muscles - Anatomy & Physiology#Skeletal Muscle|skeletal muscles]] to [[Muscles - Anatomy & Physiology#Smooth Muscle|smooth muscle]] in glands. Reflex arcs are initiated via the excitation or stimulation of specific sensory cells that are directly connected to motor neurons thus enabling [[Spinal Cord - Anatomy & Physiology#Upper and Lower Motor Neurons|motor nerve]] impulses to be automatically passed on to that particular muscle or gland. Therefore a basic reflex arc consists of '''sensory cells''' and their associated nerve fibers, '''motor nerve fibres''' and the ultimate '''muscle or gland'''.