day 10 - neuro Flashcards

1
Q

PNS is split into BLANK and BLANK systems

A

PNS is split into SENSORY and MOTOR systems

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2
Q

motor division of the PNS is split into BLANK and BLANK

A

somatic (skelital muscles) and autonomic (involuntary)

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3
Q

autonomic division of the PNS is split into BLANK and BLANK

A

sypathetic and parasympathetic

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4
Q

hormone (def)

A

chemical released into the blood

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5
Q

autonomic nervous system (func)

A

controls internal environment by sending signals to effector organs

works closely w/endocrine system (neuroendocrine system)

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6
Q

dendrite

A

carries signals TO the soma/cell body of neuron

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7
Q

axon

A

carries signals AWAY from the soma/cell body of neuron

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8
Q

1 neuron controls around BLANK muscle cells

A

1 neuron controls around 1000 muscle cells

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9
Q

how many neurons from spinal chord to target in somatic motor + sensory signals

A

1 neuron from spinal chord to target

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10
Q

how many neurons from spinal chord to target in autonomic (smooth muscle, cardiac muscle, glands, etc) signals

A

two neurons:

spinal chord to synapse (primary neuron)

synapse to target (secondary neuron)

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11
Q

arteries have BLANK muscle surrounding them

A

smooth muscle

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12
Q

can blood vessels make themselves larger?

A

vessels CANNOT make themselves bigger, the smooth muscle surrounding them relaxes

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13
Q

reaching a neuron’s threshold is caused by the BLANK of excitatory and inhibitory signals

A

SUMMATION of excitatory and inhibitory signals

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14
Q

proprioceptors (def)

A

provide CNS with sensory info about body position + movement

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15
Q

mechanoreceptors (3 types)

A

muscle spindles, golgi tendon organs, free nerve endings

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16
Q

chemoreceptors (def)

A

provide CNS with info regarding the metabolic rate + muscle activity

17
Q

baroreceptors (def)

A

provide CNS with info about pressure (ex. blood pressure in vessels)

18
Q

reflex (def)

A

rapid, unconscious reaction to stimulus

19
Q

muscle spindles (shape)

A

shaped like a spring (compresses + uncompresses)

20
Q

muscle spindles (func)

A

detect changes in muscle length + how fast it is getting longer/shorter

21
Q

what reflex are muscle spindles responsible for

A

knee-jerk reflex

22
Q

special muscle fibers name

A

intrafusal fibers

23
Q

intrafusal fibers

A

special muscle fibers

24
Q

explain the muscle action in the knee-jerk reflex

A

a rapid stretch causes a reflex contration or shortening of adjacent muscle fibers

muscle spindle sense stimulus (knee hit) and tells brain something moved BUT you didnt tell it too, protection = contraction

25
motor unit (def)
a single motor neuron and all the fibers it inervates
26
innervation ratio (def)
number of muscle cells per motor neuron ex. 1:10 in eye vs 1:1000 in leg
27
cerebellum (func)
coordinates/figures out how to get plan done (plan comes from motor cortex)
28
motor neurons in PNS carry messages from BLANk to BLANK
from spinal chord ganglia to skelital muscles
29
golgi tendon organs tell CNS...
how much tensions is being produced by entire muscle
30
golgi tendon organs protect us from BLANK
protect us from recruiting too many muscle fibers (too strong for our own good) wont let you produce too much tension
31
autonomic nervous system (func) + what it controls
assists in maintaining internal environment (involuntary) controls: smooth muscle, cardiac muscle, glands
32
is SYMPATHETIC "fight or flight" or "rest and digest"
SYMPATHETIC is fight or flight
33
is PARASYMPATHETIC "fight or flight" or "rest and digest"
PARASYMPATHETIC is rest and digest
34
is sympathetic ususally excitatory or inhibitory
excitatory
35
is parasympathetic ususally excitatory or inhibitory
inhibitory
36
sympathetic is in what devision(s) of the spinal chord
thoracic + lumbar regions of spinal chord
37
parasympathetic is in what devision(s) of the spinal chord
cervicle + sacral regions of spinal chord
38
in SYMPATHETIC system, presynaptic neuron releases BLANK onto postsynaptic neuron which releases BLANK (excitatory/inhibitory)
presynaptic neuron: releases ACh postsynaptic neuron: releases norepinephrine (+)
39
in PARASYMPATHETIC system, presynaptic neuron releases BLANK onto postsynaptic neuron which releases BLANK (excitatory/inhibitory)
presynaptic neuron: releases ACh postsynaptic neuron: releases ACh (-)