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Dictionary » S » Sarcolemma

Sarcolemma

Definition

noun

The thin, transparent, extensible membrane covering every striated muscle fiber. It consists of a cell membrane (plasma membrane) and an outer coat made up of a thin layer of polysaccharide material with numerous thin collagen fibrils.


Supplement

Its structure and design is essential in receiving and conducting stimuli. At every end of the muscle fiber, the outer layer of the sarcolemma fuses with a tendon fibers, which in turn collect into bundles to form muscle tendons.


Word origin: sarco- + Greek lemma, husk.

Synonym: myolemma.


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Biology Hangman Game

Sarcolemma.

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by Cat
Thu Jul 03, 2008 2:49 am
 
Forum: General Discussion
Topic: Biology Hangman Game
Replies: 572
Views: 45366

Need help, research

... .. that respond to external stimuli. muscles are activated by somatic motorneurons which release Ach and other substances that deploarise the sarcolemma. Thus 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: 886

muscles and bones

... Muscles can exert force by contracting and they also produce most of the heat that allows for the homeothermic condition. Check out actin, myosin, sarcolemma, intercalatid disc, visceral muscle. Doc44 Will stop here.....got to eat my pizza now.

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by Doc44
Mon May 15, 2006 12:10 am
 
Forum: Human Biology
Topic: muscles and bones
Replies: 3
Views: 906

Help me please! Going mad!!

... information and im hoping someone her could possibly help me? 1. Skeletal muscles are stimulated to contract when? A) Calcium Ions bind to the sarcolemma causing an action potential B) Acetylcholine diffuse into the sarcoplasm C) Acetylcholine binds to receptors on the sarcolema causing an ...

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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: 999

sympathetic stimulation

... and thereby increasing it's activity: pumping Ca(2+) back into the cytosol --> with the next contraction, thus more Ca(2+) from the sarcolemma is available and thus a stronger contraction.

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by sdekivit
Wed Jan 04, 2006 3:42 pm
 
Forum: Human Biology
Topic: sympathetic stimulation
Replies: 5
Views: 885


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