The Nervous System Flashcards
the Nervous System is made up of the __________ and the ___________ system
central; peripheral
The __________ and the _________ make up the central nervous system
brain; spinal cord
The peripheral nervous system is broken into these two systems:
autonomic and somatic systems
the autonomic is broken into these two divisions:
parasympathetic and sympathetic divisions
the somatic is broken into these two types of neurons:
motor and sensory neurons
a motor neuron is also called an _______ neuron
efferent
a sensory neuron is also called an ________ neuron
afferent
the neurons that exit the brain are
efferent
the part of the autonomic nervous system that regulates and conserves bodily resources is called
parasympathetic
rest and digest is another term for
parasympathetic
who is the director of the body’s involuntary responses to dangerous or stressful situations
the sympathetic nervous system
which part of NS stimulates digestion and activates metabolism?
parasympathetic nervous system
not in your book, but fun fact: The body has its own nervous system that just controls the bowel called:
enteric nervous system
What is the basic unit of the nervous system?
the nerve cell
what is another name for a nerve cell
neuron
how many neurons do we have?
billions
What are the 4 different types of neurons?
motor, sensory, receptor, inter
how many key parts is the neuron made up of?
3
myelin -where is it and why impt?
covers axon and speeds message
dendrite is to axon terminal as _____ is to ______
receiver is to sender
an action potential is dependent on
voltage across the membrane
refractory period
period when a neuron cannot be stimulated
what determines the strength of a message?
amount of connecting neurons
all or nothing
a neuron fires or doesn’t…it is not about strength. the closet light goes or it goes off, no in-between.
