Friday, April 29, 2011
Skeletal Muscle Contraction
A muscle fiber contraction is a complex interaction of organelles and molecules in which myosin binds to actin and exerts a pulling action. This results in a movement within the myofibrils in which the filaments of actin and myosin slide past one another. This action shortens the muscle fiber so that it pulls on its attachments.
A skeletal muscle fiber normally does not contract until a neurotransmitter stimulates it. Acetylcholine is the neutrotransmitter that causes muscle contraction. This neurotransmitter is synthesized in the cytoplasm of the motor neuron and stored in vesicles at the distal end of the motor neuron axons.
When a nerve impulse reaches the end of a motor neuron axon, some of the vesicles release their acetylcholine into the space between the motor neuron axon and the motor end plate. Acetylcholine diffuses rapidly across the synaptic cleft and binds to specific protein receptors in the muscle fiber membrane. The binding allows for increased membrane permeability to sodium ions. These charged particles stimulate a muscle impulse.
The sarcoplasmic reticulum contains a high concentration of calcium ions. In response to a muscle impulse, the membranes of the cisterne become more permeable to these ions, and the calcium ions diffuse into the sarcoplasm of the muscle fiber. When there is a high concentration of calcium ions in the sarcoplasm, troponin and tropomycin interact. This interaction causes the binding site on actin to become exposed. As a result, linkages form between the actin and myosin filaments, and the muscle fiber contracts. ATP is also required for the muscle contraction as long as nerve impulses release acetylcholine.
Subscribe to:
Post Comments (Atom)
Do You Need A Powerful Africa Native Doctor? I Mean A Spiritual Herbalist
ReplyDeleteWith Great Spirit Connected To Ancestors. Call or Whatsapp +2347059225064 Dr Obodubu Monday Is A High Voodoo Priest Master. He is a Spell Caster, Native
Doctor, Spiritual Herbalist, Powerful Sickle cell Healer, Spiritual
Astrologer, Psychic Reader, Multi Guru, Witch Doctor, Priest Of Africa
Money Ritual.
Have You Been To Native Doctor to Native Doctor Without Any Solution To
Your Problems Or Rather Add To it? Have You Been To Place To Place In View
Of A Powerful Native Doctor That Can Solve All Your Predicament, You Must
Understand That There Is A Native Doctor That Supersede All Native Doctor
Among All Native Doctor, If You Are In Search Of A Powerful Native Doctor
With Great Spiritual Powers, Then You Must Be In Search Of A Native Doctor
That Derives Power From The Marine World. That Is The Spirituality Of The
Greatest Africa Native Doctor Obodubu.
Dr Obodubu Is Recognized All Over The World Of Marine Kingdom, As One
Of The Top Fortunate And Most Powerful Native Doctor Of Charms Casts From
The Beginning Of His Ancestors ship Until Now Dr who lives Strong
Among All Other Native Doctors, There Have Never Been Any Form Of
Impossibility Beyond The Control Of Dr Obodubu. It Doesn't Matter The
Distance Of The Person With The Problems Or Situation, All You Have To Do
Is Believe
In The Native Obodubu charms Casts That Works, He Always
Warns Never To Get His Charms Casts If You Do Not Believe Or Unable To
Follow His Instruction.
It Is The Assignment Of The Native Doctor Obodubu To Offer
Services To Those In Need Of Spiritual Assistance Not Minding The Gravity
Of Your Situations Or Distance As Long As Water, Sea, Ocean, Lake, River
Sand etc. Are Near You, Then Your Problems Of Life Would Be Controlled
Under Your Foot.
If You Need Any Spiritual Help On Any of These:
Get Your Lover Back
Fruit Of The Womb
Fibroid
Business Boom
Financial Breakthrough
Get Rich Without Ritual Whatsapp 07059225064
Do As I Say
Bad Dream
Promise And Fail
Epilepsy
Spiritual Attack
Land/Court Case
Mental Disorder
Political Appointment
Visa Approval
Cancer
Examination Success
Spend And Get Back
Good Luck
Natural Health
Hypertension
Diabesity (Diabetic+Obesity
Stroke
Sickle Cell
Impotency
Win Court Case
Promotion At Work
Commanding Tone
Protection Ring
Marriage Success
Love Ring
Favour Ring
Recover Lost Glory
Spiritual Power For Men Of God
Travel Success Ring
Job Success
Lotto/Pool Win And Many More.
Make Haste To Call or Whatsapp Dr Obodubu Monday +2347059225064. Or Mail Him to
babadoctorobodubuspiritualhome@gmail.com For Spiritual Problem Today And
You Will Surely
Get Solution To All Your Predicament.
Email: babadoctorobodubuspiritualhome@gmail.com
Do You Need A Powerful Africa Native Doctor? I Mean A Spiritual Herbalist
ReplyDeleteWith Great Spirit Connected To Ancestors. Call or WhatsApp +2349058774809 Dr Obodubu Monday Is A High Voodoo Priest Master. He is a Spell Caster, Native
Doctor, Spiritual Herbalist, Powerful Sickle cell Healer, Spiritual
Astrologer, Psychic Reader, Multi Guru, Witch Doctor, Priest Of Africa
Money Ritual.
Have You Been To Native Doctor to Native Doctor Without Any Solution To
Your Problems Or Rather Add To it? Have You Been To Place To Place In View
Of A Powerful Native Doctor That Can Solve All Your Predicament, You Must
Understand That There Is A Native Doctor That Supersede All Native Doctor
Among All Native Doctor, If You Are In Search Of A Powerful Native Doctor
With Great Spiritual Powers, Then You Must Be In Search Of A Native Doctor
That Derives Power From The Marine World. That Is The Spirituality Of The
Greatest Africa Native Doctor Obodubu.
Dr Obodubu Is Recognized All Over The World Of Marine Kingdom, As One
Of The Top Fortunate And Most Powerful Native Doctor Of Charms Casts From
The Beginning Of His Ancestors ship Until Now Dr who lives Strong
Among All Other Native Doctors, There Have Never Been Any Form Of
Impossibility Beyond The Control Of Dr Obodubu. It Doesn't Matter The
Distance Of The Person With The Problems Or Situation, All You Have To Do
Is Believe
In The Native Obodubu charms Casts That Works, He Always
Warns Never To Get His Charms Casts If You Do Not Believe Or Unable To
Follow His Instruction.
It Is The Assignment Of The Native Doctor Obodubu To Offer
Services To Those In Need Of Spiritual Assistance Not Minding The Gravity
Of Your Situations Or Distance As Long As Water, Sea, Ocean, Lake, River
Sand etc. Are Near You, Then Your Problems Of Life Would Be Controlled
Under Your Foot.
If You Need Any Spiritual Help On Any of These:
Get Your Lover Back
Fruit Of The Womb
Fibroid
Business Boom
Financial Breakthrough
Get Rich Without Ritual WhatsApp +2349058774809
Do As I Say
Bad Dream
Promise And Fail
Epilepsy
Spiritual Attack
Land/Court Case
Mental Disorder
Political Appointment
Visa Approval
Cancer
Examination Success
Spend And Get Back
Good Luck
Natural Health
Hypertension
Diabesity (Diabetic+Obesity
Stroke
Sickle Cell
Impotency
Win Court Case
Promotion At Work
Commanding Tone
Protection Ring
Marriage Success
Love Ring
Favour Ring
Recover Lost Glory
Spiritual Power For Men Of God
Travel Success Ring
Job Success
Lotto/Pool Win And Many More.
Make Haste To Call or WhatsApp Dr Obodubu Monday +2349058774809. Or Mail Him to
babadoctorobodubuspiritualhome@gmail.com For Spiritual Problem Today And
You Will Surely
Get Solution To All Your Predicament.
Email: babadoctorobodubuspiritualhome@gmail.com
Do You Need A Powerful Africa Native Doctor? I Mean A Spiritual Herbalist
ReplyDeleteWith Great Spirit Connected To Ancestors. Call or WhatsApp +2349058774809 Dr Obodubu Monday Is A High Voodoo Priest Master. He is a Spell Caster, Native
Doctor, Spiritual Herbalist, Powerful Sickle cell Healer, Spiritual
Astrologer, Psychic Reader, Multi Guru, Witch Doctor, Priest Of Africa
Money Ritual.
Have You Been To Native Doctor to Native Doctor Without Any Solution To
Your Problems Or Rather Add To it? Have You Been To Place To Place In View
Of A Powerful Native Doctor That Can Solve All Your Predicament, You Must
Understand That There Is A Native Doctor That Supersede All Native Doctor
Among All Native Doctor, If You Are In Search Of A Powerful Native Doctor
With Great Spiritual Powers, Then You Must Be In Search Of A Native Doctor
That Derives Power From The Marine World. That Is The Spirituality Of The
Greatest Africa Native Doctor Obodubu.
Dr Obodubu Is Recognized All Over The World Of Marine Kingdom, As One
Of The Top Fortunate And Most Powerful Native Doctor Of Charms Casts From
The Beginning Of His Ancestors ship Until Now Dr who lives Strong
Among All Other Native Doctors, There Have Never Been Any Form Of
Impossibility Beyond The Control Of Dr Obodubu. It Doesn't Matter The
Distance Of The Person With The Problems Or Situation, All You Have To Do
Is Believe
In The Native Obodubu charms Casts That Works, He Always
Warns Never To Get His Charms Casts If You Do Not Believe Or Unable To
Follow His Instruction.
It Is The Assignment Of The Native Doctor Obodubu To Offer
Services To Those In Need Of Spiritual Assistance Not Minding The Gravity
Of Your Situations Or Distance As Long As Water, Sea, Ocean, Lake, River
Sand etc. Are Near You, Then Your Problems Of Life Would Be Controlled
Under Your Foot.
If You Need Any Spiritual Help On Any of These:
Get Your Lover Back
Fruit Of The Womb
Fibroid
Business Boom
Financial Breakthrough
Get Rich Without Ritual WhatsApp +2349058774809
Do As I Say
Bad Dream
Promise And Fail
Epilepsy
Spiritual Attack
Land/Court Case
Mental Disorder
Political Appointment
Visa Approval
Cancer
Examination Success
Spend And Get Back
Good Luck
Natural Health
Hypertension
Diabesity (Diabetic+Obesity
Stroke
Sickle Cell
Impotency
Win Court Case
Promotion At Work
Commanding Tone
Protection Ring
Marriage Success
Love Ring
Favour Ring
Recover Lost Glory
Spiritual Power For Men Of God
Travel Success Ring
Job Success
Lotto/Pool Win And Many More.
Make Haste To Call or WhatsApp Dr Obodubu Monday +2349058774809. Or Mail Him to
babadoctorobodubuspiritualhome@gmail.com For Spiritual Problem Today And
You Will Surely
Get Solution To All Your Predicament.
Email: babadoctorobodubuspiritualhome@gmail.com
I do not think I would have ever stop wiping if not for Dr Osasu When my lover left me the hole world was like hell I could not cope with it neither can I breathe like a real human. But all the-same I thank God for using Dr Osasu to restore my lose love and making the rest of my life full of joy and happiness by bringing back my ex lover back to me with his powerful spell. All praise and honor be onto you. if not for you Dr Osasu I don't think the rest of life would have been sweet, so all I will have to do now is to introduce you to people out there who are in similar problem or another to contact you and get there solution just like me.
ReplyDeleteHere are his details
(drosasu25@gmail.com) or call him : +2347064365391