Quiz 2 Flashcards
How many pairs of cranial and spinal nerves?
12 cranial
31 spinal
Where are cell bodies of the peripheral nervous system located?
in the ganglia
How many sets of neurons does the ANS have in a series?
2 sets
CNS consists of the
brain
ANS divisions
Sympathetic and Parasympathetic
Sympathetic division
most active during physical activity
Parasympathetic division
regulates resting functions- digestion and emptying bladder
PNS consists of
- spinal nerves
- sensory and motor divisions
Where does protein synthesis in neurons occur?
Cell bodies or soma
Dendrites
are the input part of neuron
Axons contain
the trigger zone
A neuron that carries action potentials from one neuron to another is called?
interneuron
A neuron that conducts pain sensations to the central nervous system would be classified as a
sensory or afferent neuron
Neurons that have a single axon and a single dendrite are
bipolar
Neurons in the skin that are responsible for detecting pain are
pseudo-unipolar
The blood-brain barrier
protects neurons from toxic substances in the blood
Microglia
are phagocytic cells in the CNS
Gaps or interruptions in the myelin sheath are called
nodes of Ranvier
Action potentials are conducted rapidly when transmission is
from node to node on a myelinated axon
White matter is composed of
bundles of myelinated axons
Gray matter on the surface of the brain is/are called
the cortex
Clusters of gray matter deep within the brain are called
nuclei
If there is an increase in membrane permeability to potassium the cell will
hyperpolarize
A change in resting membrane potential confined to a small area is called a
local potential
Depolarization of the nerve cell membrane occurs when there is a rapid influx of
Sodium ions
During the absolute refractory period, the cell
in insensitive to further stimulation
