KROK 1 2016 – Question 106 · KROK (Medicine) · Physiology
Experimental stimulation of sympathetic nerve branches that innervate heart caused an increase in force of heart contractions because membrane of typical cardiomyocytes permitted an increase in:
- A. Potassium ion entry
- B. Calcium ion entry
- C. Calcium and potassium ion exit
- D. Potassium ion exit
- E. Calcium ion exit
Hint
Consider which ion flux across the sarcolemma sets the strength of contraction and is enhanced by β-adrenergic signalling through cAMP.
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