KROK 1 Stomatology 2014 – Question 183 · KROK (Dentistry)
In the solution being used for perfusing the isolated heart of rat, the K⁺ concentration has been increased to 8 mmol/l. What changes in the heart are to be expected?
- A. Heart force increase
- B. There will be no changes
- C. Systolic arrest
- D. Heart rate increase
- E. Diastolic arrest
Hint
Think about how high extracellular K⁺ changes the resting membrane potential, Na⁺ channel inactivation and the excitability of cardiomyocytes.
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