Nervous System

 The nervous system is divided into two main parts: the central nervous system and the ___________ nervous system. 

 The basic functional unit of the nervous system is the ___________. 

 The central nervous system consists of the brain and the ___________. 

 The _______ nervous system is further divided into the autonomic nervous system and the somatic nervous system. 

 The primary role of the ___________ nervous system is to prepare the body for "fight or flight" responses during exercise or stress. 

 Neurons communicate with each other and with muscles through the release of chemical messengers called ___________. 

 The process by which an action potential travels along the length of a neuron is known as ___________. 

 The space between two neurons, where neurotransmitters are released to transmit signals, is called the ___________. 

 During exercise, the sympathetic nervous system stimulates the release of ___________ and noradrenaline, which increase heart rate and prepare the body for physical activity. 

 The ___________ nervous system is responsible for rest and recovery, promoting activities like digestion and relaxation.