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Physiology of Exercise > CH20 > Flashcards

CH20 Flashcards

1
Q

PERIPHERAL nervous system include sensory and motor neurons whereby
sensory=___
motor=___

A

afferent, efferent

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2
Q

sensory, afferent fibers transmit….

A

transmit impulses from receptors to CNS

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3
Q

sensation, blood and lymph vessels, skin, muscles, tendons, mechanorecptors, proprioceptors are

A

afferent fibers

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4
Q

transmit impulses from CNS to effector organs are ___ and results in muscle conraction and reflex activity

A

motor division efferent fibers

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5
Q

responsible for maintaining internal environment

A

autonomic nervous system

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6
Q

releases noreipinephrine and excites an effctor organ and inc heart rate or BP

A

sympathetic division of ANS

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7
Q

releases ach and inhibits effctor organ

A

parasympathetic division of ANS

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8
Q

cell body=

A

soma

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9
Q

receptor areas, conduct impulses toward cell body

A

dendrites

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10
Q

carries electrical impulse away from cell body toward another neuron ; may be covered by schwann cells

A

axon nerve fiber

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11
Q

forms discontinuous myelin sheath along length of axon (insulation)

A

schwann cells on nerve fibers

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12
Q

nerve impulses is propagated bounces from node to node; saltatory conduction- increases conduction velocity

A

gaps-nodes of ranvier

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13
Q

large myelinated fibers- skeletal muscle 60-100 m/sec

A

axon nerve fiber

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14
Q

non-myelinated fibers mixed in with myelinated 6-10m/sec

A

axon nerve fiber

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15
Q

ability to repsond to a stimulus and convert it to a neural impulse

A

irritability

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16
Q

transmission of the impulse along the axon

A

conductivity

17
Q
  • at rest, neurons are negatively charged inside

- determined by concentration of ions across membrane

A

resting membrane potential

18
Q

-negative charges inside cell are anions
-proteins, phosphate groups and nucleotides
-attract postively charged ions ECF
-positively charged outside cell in relation to inside
with most important being __.__.and ___

A

Na, K, Cl

19
Q

difference in ion sset up otential difference across membrane and are controlled by

A

voltage controlled gates

20
Q

resting membrane becomes less negative and more toward threshold, movement of sodium into cell , so becomes postive inside

A

depolarization of AP

21
Q

stimulus stops, gates of Na close and and K+ gates open; resting membrane potential restored

A

repolarization

22
Q

contact points between axon of one neuron and dentrite of another neuron

A

synapse

23
Q

other terms used for synapse

A

neuromuscular junction, myoneural junction, and motor end plate

24
Q
  • causes depolarization which may ormay not reach threshold;
  • sufficient amounts of NT causes depolarization to threshold
  • AP is generated
A

excitatory postsynatpic potentials [EPSP]

25
Q

temporal summation:

  • timing is important
  • successive discharges from the same terminal
  • suming several EPSPs from one presynaptic neuron
A

excitatory postsynpatic potentials (EPSP)

26
Q

hyperpolarization where NT inhibits response, sympathetic/parasympathetic slows down stim to occur

A

inhibitory postsynaptic potentials (IPSP)

27
Q

specialized synapse formed btwn a terminal end of a motor neuron and a muscle fiber

A

neuromuscular junction

28
Q

consists of all the muscle fibers innervated in a single neuron, obeys the all or none law of contraction, and make possible graded muscular contractions by the number of motor units employed

A

a motor unit

29
Q

names for aerobic muscle fibers

A

type 1, red, SO

30
Q

names for anaerobic muscle fibers

A

fast glycolytic, type 2a, type2x, white

31
Q

type of muscle fiber has greatest contraction speed

A

type2x

32
Q

type of muscle fiber that is most fatigueable

A

type2x

33
Q

fast glycolytic fibers ARE NOT used during running a marathon

A

yep

34
Q

fast oxidative glycolytic fibers are primarily used during 800 meter dash

A

truee

35
Q

there is a __ correlation between slow oxidative fibers and vo2 max

A

high

36
Q

mitochondrial density IS NOT high in FG fibers

A

mhm

37
Q

capillary density is high in SO fibers

A

true

Physiology of Exercise (5 decks)

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