Anatomy Chapter 11 Exam

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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


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