CNS
This is the main processing center of the nervous system.
CENTRAL NERVOUS SYSTEM
This division consists only of nerves.
PERIPHERAL NERVOUS SYSTEM
The basic unit of the nervous system that transmits messages.
NEURONS
The electrical signal message carried throughout the body by nerves.
NERVE IMPULSE
A change in the environment.
STIMULI
The largest region of the brain, site of intelligence, learning, and voluntary activity.
CEREBRUM
This system is associated with the voluntary control of body movements.
SOMATIC NERVOUS SYSTEM
These neurons (Efferent Neurons) carry impulses from the brain to muscles and glands.
MOTOR NEURONS
This is the location at which a neuron can transfer an impulse to another cell.
SYNAPSE
An automatic reaction that happens quickly without thinking about it.
REFLEX
This structure coordinates muscle actions, balance, and posture.
CEREBELLUM
This autonomic division is dominant in times of fear (the "fight or flight" response).
SYMPATHETIC NERVOUS SYSTEM
These neurons (Afferent Neurons) carry impulses from sense organs to the brain and spinal cord.
SENSORY NEURONS
Chemicals like Acetylcholine used to transmit an impulse across a synapse.
NEUROTRASMITTERS
Actions like digestion and breathing that cannot be controlled by your own will.
INVOLUNTARY ACTIONS
Composed of the pons and medulla oblongata, this structure connects the brain and spinal cord.
PONS AND MEDULLA OBLANGATA
The total number of pairs of spinal nerves that carry motor and sensory signals.
This type of neuron connects sensory and motor neurons, and is also known as a relay neuron.
INTERNEURONS
The two ways cells transmit messages, which are through impulses and these.
CHEMICALS
The term for actions done consciously in your mind.
VOLUNTARY ACTIONS
This structure receives all sensory messages and relays them to the cerebrum, also preventing sensory overload.
THALAMUS
This autonomic division restores the body to a state of calm.
AUTONOMIC NERVOUS SYSTEM
The estimated number of nerve cells in the brain, according to Suzana Herculano-Houzel.
86 BILLION
The main chemical mentioned that is a type of neurotransmitter.
ACETHYLCOLINE
The state of internal balance that the Autonomic Nervous System works to maintain.
HOMEOSTASIS