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Week 14
Cardiac
6
Medical
Professional
11/27/2011
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Term
What type or reticulum is present in cardiac cells?
 Definition
Sarcoplasmic reticulum
Term
What is the resting potential of a cardiac muscle cell determined by?
 Definition
The balance between the concentration gradient and electrostatic forces for K.
Term
At rest, in the heart, are all K channels open?
 Definition
No - only some K channels are open at rest.
Term
During the contractile process in the heart, what activates myosin heads?
 Definition
ATP hydrolysis
Term
What two molecules form the crossbridge during muscle contraction?
 Definition
Myosin heads and actin filaments
Term
The release of this molecule results in the power stroke
 Definition
Phosphate
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