KROK 1 2017 – Question 122 · KROK (Medicine) · Physiology
Experimental stimulation of the sympathetic nerve branches that innervate the heart caused an increase in the force of heart contractions because the membrane of typical cardiomyocytes permitted an increase in:
- A. Calcium ion exit
- B. Calcium and potassium ion exit
- C. Potassium ion exit
- D. Calcium ion entry
- E. Potassium ion entry
Hint
Think about which ion current is modulated by the cAMP and protein kinase A pathway after sympathetic stimulation, and in which direction it must change to strengthen the beat.
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