Neuron structure
_____ matter is made of _____ axons
White, Myelinated
A fiber bundle in the PNS is a
Nerve
The resting membrane potential is
-70 mV
This is the space neurotransmitters must cross to bind to receptors on a postsynaptic cell
Synaptic cleft
The central canal of the spinal cord contains
cerebrospinal fluid
What relays information within the CNS?
Interneurons
The deepest connective tissue layer in a nerve is the
Endoneurium
During rising phase,
sodium (Na+) ions enter the cell, making the cytosol less negative
Common neurotransmitters include
Dopamine, norespinephrine, acetylocholine, and serotonin
A plexus is
a network of nerves
In the PNS, the ____ is formed by _____, with the outermost membrane called the ______
Myelin sheath, Schwann cells, neurilemma
Star-shaped astrocytes help form the
In the falling phase,
potassium ions leave the cell and the potential can reach -90 mV
These receptors bind acetycholine and are found on skeletal muscles and parasympatic target cells
Cholinergic
Dermatomes are
skin regions supplied by specific spinal nerves
Dendrites
_____ are CNS cells that act as pagorytes to remove waste and pathogens
Microglia
When the membrane potential becomes more negative than the resting state
Hyperpolarization
Adrenergic receptors bind
epinephrine or nonepinephrine
The five components of a reflex arc are
receptors, sensory neuron, central nervous system, motor neuron, and effector
The functional cells of the nervous system are
neurons
______ are ciliated cells that line ventricles and synthesize cerebrospinal fluid
Ependymal cells
This occurs when action potentials "jump" between nodes of a myelinated axon
Salatory conduction
Adrenergic receptors are found
on sympathetic target cells
A simple reflex
is rapid, simple, and automotive