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Sarcoplasmic reticulum



The special type of smooth endoplasmic reticulum found in smooth and striated muscle fibers whose function is to store and release calcium ions.


The sarcoplasmic reticulum releases calcium ions during muscle contraction and absorb them during relaxation.

Word origin: Greek sarx = "flesh".

Compare: endoplasmic reticulum.

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Re: Muscle Contractions

... cell membrane (sarcolemma) which stimulates Ca2+ release from the sarcoplasmic reticulum to stimulate contraction (second messenger). The myosin fibers (on actin) are blocked ...

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by Jpoley
Tue Mar 01, 2011 2:42 am
Forum: Human Biology
Topic: Muscle Contractions
Replies: 1
Views: 7820

Two questions about physiology lab?

... overlap, calcium doesn't have enough time to get pumped back into the sarcoplasmic reticulum. If you you stimulate it fast enough, it will cause more calcium to be released, ...

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by LeslieSamuel
Thu Dec 24, 2009 2:50 am
Forum: Physiology
Topic: Two questions about physiology lab?
Replies: 1
Views: 3009

Need help, research

... highly dependant on receptors (including the internal receptors on the sarcoplasmic reticulum which releases Ca(2+) into the sarcoplasm)

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by sdekivit
Sun Jul 16, 2006 6:14 pm
Forum: Cell Biology
Topic: Need help, research
Replies: 8
Views: 4143

Calcium regulated muscle cell contraction

I know that when a muscle cell receives a signal to contract, the sarcoplasmic reticulum releases Ca++ (which then binds to tropomyosin allowing myosin head to walk up the ...

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by dae
Sat May 06, 2006 12:43 am
Forum: Cell Biology
Topic: Calcium regulated muscle cell contraction
Replies: 1
Views: 3691

Help me please! Going mad!!

... the sarcolema causing an action potential D) Atp is released from the sarcoplasmic reticulum E) Oxygen binds to myoglobin 2. The role of Acetylcholine in skeletal muscle contractions ...

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by Jan-Jan
Tue Jan 31, 2006 5:55 pm
Forum: Human Biology
Topic: Help me please! Going mad!!
Replies: 6
Views: 5062
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