BMC Exam 2 questions with correct answers

BMC Exam 2 questions with correct answers
- |the |signal |that |passes |from |one |neuron |to |the |next |and |finally |the |end |organ |(muscle |fibers) |- |
VERIFIED |ANSWER✔✔-Nerve |Impulse |(Action |Potential)



-70 |mV |- |VERIFIED |ANSWER✔✔-Dynamic |Equilibrium



Nerves |transmit |information |by |__________________________ |across |the |membrane |- |VERIFIED |
ANSWER✔✔-changing |the |potential



RMP |moves |closer |to |0 |mV |- |VERIFIED |ANSWER✔✔-Depolarization



Before |a |nerve |can |be |depolarized |and |an |AP |started, |there |must |be |sufficient |stimulation.

In |a |nerve, |typically |this |threshold |is |at |___________ |- |VERIFIED |ANSWER✔✔--55mV



__________neurons |send |sensory |information |to |the |CNS



__________neurons |send |executing |information |to |periphery |(information |to |cause |your |muscle |to |
contract) |- |VERIFIED |ANSWER✔✔-afferent, |efferent



oBrain, |spinal |cord

oWhere |human |movement |is |initiated, |controlled, |and |monitored |- |VERIFIED |ANSWER✔✔-Central |
Nervous |System |(CNS)



oBranching |nerves |outside |of |spinal |cord |- |VERIFIED |ANSWER✔✔-Peripheral |Nervous |System |(PNS)



oFunctional |unit |of |the |nervous |system |- |VERIFIED |ANSWER✔✔-Neuron



oCarry |signals |to |muscle |- |VERIFIED |ANSWER✔✔-Motor |neurons

,oSensory: |"ascending" |info |to |spinal |cord |and |brain |- |VERIFIED |ANSWER✔✔-Afferent |Neurons



oMotor: |"descending" |info |from |CNS/ |Spinal |Cord |to |muscles |- |VERIFIED |ANSWER✔✔-Efferent |
Neurons



oAfferent |to |Efferent

oEfferent |to |Efferent

oHigher |centers |to |spinal |cords |- |VERIFIED |ANSWER✔✔-Internuerons



oBody |of |cell |- |VERIFIED |ANSWER✔✔-Soma



oBundles |of |cell |bodies |just |outside |the |spinal |cord |- |VERIFIED |ANSWER✔✔-Ganglia



oProjections |on |the |cell |body |that |serve |as |receivers |- |VERIFIED |ANSWER✔✔-Dendrites



oLarge |nerve |fiber |that |branches |out |from |spinal |cord |- |VERIFIED |ANSWER✔✔-Axon



oLarge, |rapidly |transmitting |neuron |- |VERIFIED |ANSWER✔✔-Alpha |motor |neuron



oCovered |with |an |insulated |shell |- |VERIFIED |ANSWER✔✔-Myelinated



oInsulation |enveloping |specific |section |of |axon |- |VERIFIED |ANSWER✔✔-Schwann |cells



oGap |in |between |Schwann |cells |- |VERIFIED |ANSWER✔✔-Node |of |Ranvier



Motor |end |plates

Synapse

oSmall |gap |between |terminal |branch |of |neuron |and |muscle |- |VERIFIED |ANSWER✔✔-Neuromuscular |
Junction

, -composed |of |a |motor |neuron |and |all |of |the |muscle |fibers |it |innervates

-It |is |the |smallest |functional |unit |of |muscular |shortening

-# |of |fibers |in |a |m.u. |is |dependent |on |the |precision |of |movement |required |of |that |muscle |(average: |
100-200 |fibers |per |m.u.)

omore |precision |is |obtained |with |more |neurons

o100 |to |2000 |motor |neurons |per |muscle |- |VERIFIED |ANSWER✔✔-motor |unit



When |they |receive |sufficient |stimulation, |all |fibers |of |a |motor |unit |produce |tension |together |- |
VERIFIED |ANSWER✔✔-All-or-none |principle



All |fibers |in |motor |unit |are |_______type

•Type |I, |IIa, |or |IIx

increased |__________ |can |be |accomplished |by:

oincreasing |the |# |of |stimulated |motor |units |(recruitment)

oincreasing |the |stimulation |rate |of |the |active |motor |units |(rate |coding) |- |VERIFIED |ANSWER✔✔-same,
|tension




oSlow |contraction |times |(>70 |ms)

oGenerates |little |tension

oHighly |fatigue |resistant

oMaintaining |posture

oDistance |runner |- |VERIFIED |ANSWER✔✔-Type |I



oFast |contraction |times |(30-50 |ms)

oMore |fatigue |resistant |than |type |IIb

oSwimming, |bicycling |- |VERIFIED |ANSWER✔✔-Type |IIa



oRapid |contraction |times |(30-40 |ms)

oInnervated |by |alpha |motor |neurons