Ch 13 Lec 1 - Nervous System Flashcards
coordinate all body systems and this is accomplished by the transmission of signals
nervous system
the nervous system is a blank signaling system
electrochemical
communication system that is a slower scale and uses chemicals in the blood stream called blank
endocrine system, hormones
two communication systems of the body
nervous, endocrine
nervous system is made up of many blank, each composed of several tissues
organs
three things that make up nervous system
neurons, neuroglia, blood vessels, connective tissue
2 divisions of the nervous system
central, peripheral
the brain and spinal cord make up the blank nervous system
central
cranial and spinal nerves make up the blank nervous system
peripheral
the central nervous system is covered by blank
meninges
central nervous system is bathed in blank fluid
cerebrospinal
nervous system that is the integration center
central
nervous system that has both sensory and motor fibers
peripheral
the PNS connects the CNS to blank and blank
glands, muscles
this nervous system brings information to and from the CNS
PNS
two divisions of the PNS
afferent, efferent
the sensory division of the PNS
afferent
the motor division of the PNS
efferent
two divisions of the efferent division
somatic, autonomic
conscious control division of the efferent division
somatic
unconscious division of the efferent division
autonomic
order of a general function of the nervous system
receptors, sensory, integrative, motor, effector
receptor of nervous system does what
detects stimuli
sensory is felt by blank
afferent PNS
integrative part of nervous system
CNS
motor part of nervous system is the blank
efferent PNS
the effector of the nervous system
muscle/gland
structural and functional units of nervous system, excitable and amitotic
neurons
nervous tissue cell that are accessory cells and act like connective tissue
neuroglial
three major structures of neurons
soma, dendrites, axon
cell body of a neuron
soma
soma is blank
mononucleate
four parts of soma
nissl bodies, axon hillock, perikaryon, neurofibrils
part of soma with ribosome clusters and give a gray color
nissl bodies
part of soma that connects soma to axon
axon hillock
region around the nucleus in soma
perikaryon
cytoskeleton that extend into dendrites/axon and gives shape in soma
neurofibrils
part of neuron that respond to neurtransmitters
dendrites
dendrites are short, branched, and blank
unmyelinated
dendrites are specialized for blank with other neurons
contact
axon is only blank
1 cell
axon conducts nerve impulses blank soma
away from
axon can give off blank
collaterals
axon are wrapped in blank
myelin sheath
glial cells wrapped around the axon
myelin sheath
axons end in blank
synaptic terminals
axons produce blank
neurotrasmitters
movement of cellular materials (not signals) through the axon
axonal transport
axonal transport that is away from soma; and transports neurotransmitters, organelles, nutrients
anterograde
axonal transport toward soma, degraded materials to be recycled & extracellular substances
retrograde
cytoplasm of an axon
axoplasma
axoplasma consists of few blank
organelles
plasma membrane of an axon
axolemma
axolemma has these three things
collaterals, telodendra, synaptic terminal
side branches of axolemma
collaterals
neuron shape that is small and axons can not be distinguished from dendrites
anaxonic
anaxonic neurons are found mostly in the blank
CNS
neuron shape that is several small dendrites converged onto one and the dendrite/axon are separated by soma
bipolar
bipolar neuron cells are blank
unmyelinated
neuron shape that is several small dendrites converged onto one large one and the dendrite/axon are continuous
unipolar
unipolar neurons are usually blank
myelinated
majority of unipolar neurons are sensory neurons in the blank
PNS
shape of neuron that is many dendrites extend from soma and a long axon
multipolar
multipolar neurons are blank
myelinated
the majority of motor neurons in the PNS are blank
multipolar
multipolar neurons are also in the blank of CNS
spinal interneurons
neurons that have sensory function
afferent
cell body is usually outside the CNS in blank neurons
afferent
afferent neurons have receptor ends on blank or are associated with receptor cells in blank organs
dendrites, sense
three types of receptors in afferent neurons
exteroreceptors, proprioceptors, interoceptors
touch, temp, pressure, light chemicals are detected by blank receptors
exteroceptors
receptor that monitor muscle and skeleton position
proprioceptors
receptors that monitor internal systems
interoceptors
neurons only in the CNS and are the most abundant neurons
interneurons
two classifications of interneurons
excitatory, inhibitory
interneurons blank two or more neurons
link
neurons that have motor function and the cell body is usually inside the CNS
efferent
efferent neurons that control skeletal muscles
somatic
efferent neurons that control smooth muscles and glands
autonomic
cells that are called satellite or schwann cells in the PNS
neuroglial cells
cells that are called astrocytes, oligodendrocytes, ependymal cells, microglia in the CNS
neuroglial cells
largest and most common neuroglial cell that is star shaped
astrocytes
three functions of astrocytes
structure, repair, metabolism, regulate ions, guide neurons to targets, form blood brain barrier