HHP 3114 Exam 2 Questions With 100%
Correct Answers
The |motor |unit |consists |of |- |CORRECT |ANSWER✔✔-A |motor |neuron |and |all |the |fibers |the |
neuron |innervates
Do |small |muscles |have |few |or |many |fibers? |- |CORRECT |ANSWER✔✔-Few
Do |large |muscles |have |few |or |many |fibers? |- |CORRECT |ANSWER✔✔-Many
Muscle |fibers |within |a |motor |unit |are |the |same |or |different |types? |- |CORRECT |ANSWER✔✔-
Same
What |are |the |three |primary |fiber |types |in |human |skeletal |muscle? |- |CORRECT |ANSWER✔✔-
Slow |twitch |oxidative |(SO), |fast |twitch |oxidate |glycolytic |(FOG), |fast |twitch |glycolytic |(FG)
Fiber |types |chart |- |CORRECT |ANSWER✔✔-
True |or |false: |there |are |significant |differences |between |men |and |women |with |regard |to |fiber |
type |distribution |patterns |- |CORRECT |ANSWER✔✔-false
True |or |false: |our |fiber |type |pattern |is |genetically |determined |- |CORRECT |ANSWER✔✔-true
Excitation-Contraction |Coupling |Process |- |CORRECT |ANSWER✔✔-Phase |I-Generation |of |an |
action |potential |and |spread |of |depolarization |along |sarcolemma
Phase |II- |Release |of |calcium |from |the |sarcoplasmic |reticulum |(SR) |and |binding |of |calcium |to |
troponin
Phase |III- |Crossbridge |formation, |sliding |of |myofilaments, |and |generation |of |force
,Sliding |Filament |Theory |- |CORRECT |ANSWER✔✔-Best |explains |the |process |of |muscle |
contraction, |involves |the |interaction |of |myofilaments
Thin |filaments |- |CORRECT |ANSWER✔✔-Actin, |troponin, |tropomyosin
Thick |filaments |- |CORRECT |ANSWER✔✔-Myosin
Role |of |filaments |- |CORRECT |ANSWER✔✔-troponin- |Calcium |binds |to |troponin |causing |a |shift |
in |tropomyosin |exposing |the |binding |site |on |actin
tropomyosin-At |rest |blocks |the |binding |site |on |actin
actin- |Constructed |like |two |intertwined |strands |of |pearls, |contains |binding |sites |for |myosin |
heads
myosin- |Myosin |heads |bind |to |actin |to |form |crossbridges, |power |stroke |(like |oars |to |a |
rowboat)
Relaxation |of |a |muscle |- |CORRECT |ANSWER✔✔-Calcium |concentration |rapidly |decreases |when
|muscle |stimulation |ceases, |calcium |is |actively |pumped |back |into |sarcoplasmic |reticulum, |
tropomyosin |returns |to |resting |position |covering |the |actin |binding |sites
What |is |the |series |of |events |that |leads |to |muscle |contraction |in |the |sliding |filament |model? |At
|rest |- |CORRECT |ANSWER✔✔-Tropomyosin |inhibits |actin-myosin |binding, |calcium |is |stored |in |
the |sarcoplasmic |reticulum
What |is |the |series |of |events |that |leads |to |muscle |contraction |in |the |sliding |filament |model? |
Contraction |- |CORRECT |ANSWER✔✔-1. |Neural |stimulation |causes |the |sarcoplasmic |reticulum |
to |release |calcium
2. |Calcium |binds |to |troponin, |which |removes |the |inhibitory |effect |of |tropomyosin |and |actin-
myosin |bind
3. |Myosin |cross-bridges |swivel, |pulling |the |actin |and |z-lines
, 4. |Fresh |ATP |binds |to |the |myosin |cross-bridges, |leading |to |cross-bridge |recycling
5. |Neural |stimulation |ceases |and |relaxation |occurs
What |are |the |boundaries |of |a |sarcomere? |- |CORRECT |ANSWER✔✔-z-lines
An |individual |muscle |cell |is |called |a |- |CORRECT |ANSWER✔✔-muscle |fiber
A |muscle |fiber |is |enclosed |by |a |plasma |membrane |called |the |- |CORRECT |ANSWER✔✔-
sarcolemma
The |cytoplasm |of |a |muscle |fiber |is |called |a |- |CORRECT |ANSWER✔✔-sarcoplasm
Within |the |sarcoplasm, |the |extensive |T-tubules |allow |- |CORRECT |ANSWER✔✔-transport |of |
substances |throughout |the |muscle |fiber
The |sarcoplasmic |reticulum |stores |- |CORRECT |ANSWER✔✔-calcium
Parts |of |the |sarcomere |- |CORRECT |ANSWER✔✔-I |band |(light |zone)
A |band |(dark |zone)
H |zone |(middle |of |A |band)
M |line |(middle |of |H |zone)
rest |of |A |band
second |I |band
Myofibrils |are |made |up |of |- |CORRECT |ANSWER✔✔-sarcomeres
A |sarcomere |is |composed |of |protein |filaments |of |- |CORRECT |ANSWER✔✔-myosin |and |actin
Correct Answers
The |motor |unit |consists |of |- |CORRECT |ANSWER✔✔-A |motor |neuron |and |all |the |fibers |the |
neuron |innervates
Do |small |muscles |have |few |or |many |fibers? |- |CORRECT |ANSWER✔✔-Few
Do |large |muscles |have |few |or |many |fibers? |- |CORRECT |ANSWER✔✔-Many
Muscle |fibers |within |a |motor |unit |are |the |same |or |different |types? |- |CORRECT |ANSWER✔✔-
Same
What |are |the |three |primary |fiber |types |in |human |skeletal |muscle? |- |CORRECT |ANSWER✔✔-
Slow |twitch |oxidative |(SO), |fast |twitch |oxidate |glycolytic |(FOG), |fast |twitch |glycolytic |(FG)
Fiber |types |chart |- |CORRECT |ANSWER✔✔-
True |or |false: |there |are |significant |differences |between |men |and |women |with |regard |to |fiber |
type |distribution |patterns |- |CORRECT |ANSWER✔✔-false
True |or |false: |our |fiber |type |pattern |is |genetically |determined |- |CORRECT |ANSWER✔✔-true
Excitation-Contraction |Coupling |Process |- |CORRECT |ANSWER✔✔-Phase |I-Generation |of |an |
action |potential |and |spread |of |depolarization |along |sarcolemma
Phase |II- |Release |of |calcium |from |the |sarcoplasmic |reticulum |(SR) |and |binding |of |calcium |to |
troponin
Phase |III- |Crossbridge |formation, |sliding |of |myofilaments, |and |generation |of |force
,Sliding |Filament |Theory |- |CORRECT |ANSWER✔✔-Best |explains |the |process |of |muscle |
contraction, |involves |the |interaction |of |myofilaments
Thin |filaments |- |CORRECT |ANSWER✔✔-Actin, |troponin, |tropomyosin
Thick |filaments |- |CORRECT |ANSWER✔✔-Myosin
Role |of |filaments |- |CORRECT |ANSWER✔✔-troponin- |Calcium |binds |to |troponin |causing |a |shift |
in |tropomyosin |exposing |the |binding |site |on |actin
tropomyosin-At |rest |blocks |the |binding |site |on |actin
actin- |Constructed |like |two |intertwined |strands |of |pearls, |contains |binding |sites |for |myosin |
heads
myosin- |Myosin |heads |bind |to |actin |to |form |crossbridges, |power |stroke |(like |oars |to |a |
rowboat)
Relaxation |of |a |muscle |- |CORRECT |ANSWER✔✔-Calcium |concentration |rapidly |decreases |when
|muscle |stimulation |ceases, |calcium |is |actively |pumped |back |into |sarcoplasmic |reticulum, |
tropomyosin |returns |to |resting |position |covering |the |actin |binding |sites
What |is |the |series |of |events |that |leads |to |muscle |contraction |in |the |sliding |filament |model? |At
|rest |- |CORRECT |ANSWER✔✔-Tropomyosin |inhibits |actin-myosin |binding, |calcium |is |stored |in |
the |sarcoplasmic |reticulum
What |is |the |series |of |events |that |leads |to |muscle |contraction |in |the |sliding |filament |model? |
Contraction |- |CORRECT |ANSWER✔✔-1. |Neural |stimulation |causes |the |sarcoplasmic |reticulum |
to |release |calcium
2. |Calcium |binds |to |troponin, |which |removes |the |inhibitory |effect |of |tropomyosin |and |actin-
myosin |bind
3. |Myosin |cross-bridges |swivel, |pulling |the |actin |and |z-lines
, 4. |Fresh |ATP |binds |to |the |myosin |cross-bridges, |leading |to |cross-bridge |recycling
5. |Neural |stimulation |ceases |and |relaxation |occurs
What |are |the |boundaries |of |a |sarcomere? |- |CORRECT |ANSWER✔✔-z-lines
An |individual |muscle |cell |is |called |a |- |CORRECT |ANSWER✔✔-muscle |fiber
A |muscle |fiber |is |enclosed |by |a |plasma |membrane |called |the |- |CORRECT |ANSWER✔✔-
sarcolemma
The |cytoplasm |of |a |muscle |fiber |is |called |a |- |CORRECT |ANSWER✔✔-sarcoplasm
Within |the |sarcoplasm, |the |extensive |T-tubules |allow |- |CORRECT |ANSWER✔✔-transport |of |
substances |throughout |the |muscle |fiber
The |sarcoplasmic |reticulum |stores |- |CORRECT |ANSWER✔✔-calcium
Parts |of |the |sarcomere |- |CORRECT |ANSWER✔✔-I |band |(light |zone)
A |band |(dark |zone)
H |zone |(middle |of |A |band)
M |line |(middle |of |H |zone)
rest |of |A |band
second |I |band
Myofibrils |are |made |up |of |- |CORRECT |ANSWER✔✔-sarcomeres
A |sarcomere |is |composed |of |protein |filaments |of |- |CORRECT |ANSWER✔✔-myosin |and |actin
