KROK 1 2015 – Question 82 · 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. Potassium ion entry
- B. Potassium ion exit
- C. Calcium ion entry
- D. Calcium ion exit
- E. Calcium and potassium ion exit
Hint
Ask which intracellular messenger cascade sympathetic transmitters start in cardiomyocytes and which membrane channel it modifies to strengthen contraction.
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