ge-sensitive protein nels open and allow Acetylcholi syn elease from terminal of the SR. Ca2+ flows the sarcoplasm Action F ax indo trepen in wh ieh

Anatomy & Physiology
1st Edition
ISBN:9781938168130
Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Chapter10: Muscle Tissue
Section: Chapter Questions
Problem 2ILQ: Every skeletal muscle fiber is supplied by a motor neuron at the NMJ. Watch this video...
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Put in order the steps of activation, excitation and contraction of skeletal muscle. 

Detachment- uses a 2nd
Voltage-sensitive protein
Acetylcholine is released into
molecule of ATP
channels open and allow
synaptic cleft
Ca2+ release from terminal
cisterns of the SR. Ca2+ flows
into the sarcoplasm
Action potential arrives at
axon terminal
Cross bridge formation:
Myosin head binds actin-
uses 1 ATP
Ca2+ binds troponin which
Ca2+ enters axon terminal
removes tropomyocin from
the myosin binding sites.
Myosin binding sites are now
Power stroke
exposed. Cross bridge
formation can occur
Ach binds to receptors on
sarcolemma opening Na+
and K+ channels
Reset/ recock of myosin
head
AP propagates along
sarcolemma
End plate potential on
sarcolemma
AP travels down T-Tubules
Transcribed Image Text:Detachment- uses a 2nd Voltage-sensitive protein Acetylcholine is released into molecule of ATP channels open and allow synaptic cleft Ca2+ release from terminal cisterns of the SR. Ca2+ flows into the sarcoplasm Action potential arrives at axon terminal Cross bridge formation: Myosin head binds actin- uses 1 ATP Ca2+ binds troponin which Ca2+ enters axon terminal removes tropomyocin from the myosin binding sites. Myosin binding sites are now Power stroke exposed. Cross bridge formation can occur Ach binds to receptors on sarcolemma opening Na+ and K+ channels Reset/ recock of myosin head AP propagates along sarcolemma End plate potential on sarcolemma AP travels down T-Tubules
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