Anatomy Chapter 11 Exam
there are _____ pairs of cranial nerves and ______ pairs of spinal nerves
12; 31
a neuron with several dendrites and a single axon would be called a ________ neuron
multipolar
gaps or interruptions in the myelin sheath are called
nodes of Ranvier
an action potential
occurs when the local potential reaches threshold level
digestion of food is regulated by the
parasympathetic division of the ANS
most unipolar neurons are _________ neurons
sensory
a neuron that conduct pain sensations to the CNS would be classified as a(n)
sensory or afferent neuron
the junction between two neurons is a
synapse
the plasma membrane of a neuron is more permeable to potassium ions because
there are more non-gated channels for K+ than Na+
the motto division of the PNS
transmits impulses from the CNS to skeletal muscle
neurons in the skin that are responsible for detecting pain are
unipolar
voltage-gated sodium channels are sensitive to changes in the extracellular concentration of
calcium ions
the sensory division of the PNS
conveys action potentials to the CNS
the PNS includes the
cranial nerves
____ are processes that conduct electric signals toward the cell body
dendrites
the nervous system a. monitors internal and external stimuli b. transmits information in the form of action potentials c. interprets of assesses information d. maintains homeostasis e. all of the above
e. all of the above
gap junctions are functional ______ synapses
electrical
overproduction of cerebral fluid could be the result of overactivity of the
ependymal cells
action potentials are conducted more rapidly when transmission is
from node to node on a myelinated axon
__________ are collections of neuron cell bodies located outside of the CNS
ganglia
cell bodies of the PNS are located in
ganglia
which of the following substances must pass through the blood-brain barrier in order for neurons to survive
glucose
axons
have a distal portion that branches to form the presynaptic terminal boutons
a neuron that carries action potentials from one neuron to another is called a(n)
interneuron
electrical properties of cels result from what two characteristics
1. concentration differences 2. permeability characteristics
nervous tissue is organized so that axons form bundles and neuron cell bodies. What are the two groups
1. white matter 2. gray matter
which is responsible for problem-solving skills
CNS
the nervous system has two subdivisions- the CNA and the
PNS
a stimulus either causes an action potential or it doesn't. This is called
all or none response
microglia
are phagocytic cells in the CNS
dendrites
are the input part of the neuron
a neuroglial cell that is a major component of the blood-brain barrier is the
astrocyte
white matter is composed of
bundles of myelinated axons
neurons that have a single axon and a single dendrite are
bipolar
protein synthesis in neurons occurs in
cell bodies or soma
The flu virus increases membrane permeability to potassium. You would expect cells to
hyperpolarize
the CNS
is the site for processing information
the permeability of the plasma membrane to ions is determined by ________ and _______
leak; gated
________ are neuroglia that are macrophages
microglia
the CNS includes the
spinal cord