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.
Reflex Arcs â¢In a knee-jerk reflex arc thesensory neuron directlyconnects to the motor neuronin the spinal cord. This iscalled a simple reflex arc. â¢ Follow the sensory neuronfrom the spindle (receptor) towhere it connects with the motorneuron in the spinal cord.Nerve cells (neurons)carry the message fromthe stimulated receptorsto the correct effectors.â¢ A sensory neuron carriesthe message from the receptorto the central nervous system (the spinal cord and brain). â¢ A motor neuron carries themessage from the centralnervous system to the effector.â¢ This is a reflex arc.