MadSci Network: Neuroscience
Query:

Subject: The 'All-or-None' law for muscle contractions. Where does it work?

Date: Thu Mar 15 11:28:49 2001
Posted by Ashutosh
Grade level: 10-12 School: Dropout
City: Jaipur State/Province: Rajasthan Country: India
Area of science: Neuroscience
ID: 984673729.Ns
Message:

I was reading about human muscles the other day, and came across this law that 
stated that if a muscle received a stimulus greater than a certain value (it was 
called a threshold stimulus), the muscle contracted with full intensity. 
Basically, that meant that either a muscle contracted with all the strength it 
possibly could (All) or it didn't contract at all (None). What I want to know is 
whether this law is applicable for all kinds of muscles (striated/striped, 
smooth and cardiac) or is it applicable for just striated. One of the books I 
looked up said that it was only true for striated ones which are voluntary, and 
another book said that it held true for all kinds of muscles and even held true 
for nerves. Help! 


Re: The 'All-or-None' law for muscle contractions. Where does it work?

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