What is active relaxation of cardiac muscle?

[rsweeney]

What is ACTIVE relaxation of cardiac muscle?

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[bewitched1081]

if the basic contraction mechanism for cardiac muscle is the same as for skeletal, then it might refer to the fact the ca2+ is actively pumped back into the things (i forgot what they were called) in which they are contained and released upon depolarization.

 

[Olanzapine]

Originally posted by bewitched1081
if the basic contraction mechanism for cardiac muscle is the same as for skeletal, then it might refer to the fact the ca2+ is actively pumped back into the things (i forgot what they were called) in which they are contained and released upon depolarization.

Sarcoplasmic reticulum (SR).

 

[Gleevec]

Im guessing that refers to the diastole phase of heart contraction.
The "things" bewitched is referring to might be the myocardium? I believe that during diastole that Ca is actively pumped out of the myocardium, hence active.

This is a very vague guess though, so take it with a heaping of salt.