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CHAPTER 8: THE NERVOUS SYSTEM (kahoot questions (neuro transmiters are…
CHAPTER 8: THE NERVOUS SYSTEM
8:1
afferent: brings sensory information to the CNS (central nervous system
efferent: somatic nervous system (SNS) voluntary control over skeletal muscle contractions)
(ANS) ; automatic involuntary regulation of smooth muscle, cardiac muscle, and glandular muscle
8:5
CNS = spinal cord and brain
menengies orotect and support the spinal cord and delicate brain. the crainial menegies = dura mater, arachnoid, and pia mater.
dura matter covers the brain and spinal cord. the epurduail space seperates the spinal dura ater from the walls of the vertebral canal, r=the subarachnoid space of the arachnoid layer contains cerebrospinail fluid.
8:2
sensory neurons for afferent division and deliver info to the CNS -- motor neurons stimulate the activity of peripheral tissue --- inter neurons analyze sensory inputs and coordinate motor outputs
an axon has several dendrites ans synaptic terminals
neurons: information and transfer processing -- Neuroglia: supporting framework and act as phagocytes
NEUROGLIA : astrocytes - largest and most numerous. oligodendrocytes - responsible for myelontation of CNS. microglia - phagocytic cells from white blood cells. ependdymal cells - cerebral spinal fluid
8:3
the opening of sodium channels and membrane depolarization. the closing i=of sodium channels and opening of potassium channels and return permeability
an action potential appears when the membrane depolarizes to a level known as threshold
8:4
synapse is a site where intrcelluar communications occur through the realse of chemicals called neurotransmitters. synapese communicating eith other cells = neuroneffetor juction
neutral communication moves from the presynaptic neuron to the post synaptic neauron caross the synapic cleft.
cholinergic synapese realese = acetylchonie
8:6:
white mater contains mylinated and unmyolinated axons; gray matter contains cell bodies of neurons and glial cells.projections of rgey matter toard the outer surface of the spinal cord are called horns.
spinal chord has 31 segments; each associated with a pair of dorsal root ganglia and their dorsal rootd and a paor of venrtal roots.
kahoot questions
neuro transmiters are realesed from the synaptic knobs
chemical synapsys dominates
inate the realese of acetylcholine = calcium
adrenergic synapse realese ; norenephrene
recep, sensory, inter,motor, effector
blood vessels = pia mater spinal cord