natremia The presence of sodium ions in the blood. Derived terms . dysnatremia; hypernatremia; hyponatremia; natremic; Translations
A reflex arc is a nerve pathway in the body of humans and some animals that connects certain muscle groups to others, without involving the brain. These sorts of pathways primarily control involuntary movements in response to some sort of stimulus.
The system includes all the neurons connected with muscles, skin and sense organs. The somatic nervous system consists of efferent nerves responsible for sending brain signals for muscle contraction.Examples: (1) Reflexive response-A reflex arc is an automatic reaction that allows an organism to protect itself when an imminent danger is perceived.he system includes all the neurons connected with muscles, skin and sense organs. The somatic nervous system consists of efferent nerves responsible for sending brain signals for muscle contraction.