The force-frequency relation in the heart (the relation between frequency of stimulation and strength of the heart) is caused principally by
A) Stretch of the cardiac muscle with Increasing frequency of stimulation
B) Increased in the sensit ivity of the myofilaments to Ca2+
C) Phosphorylation of TnC
D) Increased [Ca2+] in the mitochondria
E) Increased [Ca2+] transients due to loading of the SR
Correct Answer:
Verified
Q1: Cardiac m uscle cannot increase its strength
Q3: Removal of external Ca2+ to levels below
Q4: Stretch increases the force of cardiac contraction
Q5: Cardiomyocytes form a functional syncytium by being
Q6: Relaxation of the cardiomyocytes is caused mainly
Q7: In cardiac muscle, the T-tubules are located
A)
Q8: “Calcium-induced calcium release” refers to
A) Increased Ica
Q9: Cardiac muscle can increase its strength of
Q10: Sympathetic stimulation increases all of the following
Q11: Ca2+ enters the cardiomyocytes every heart beat
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