KROK 1 2013 – Question 145 · KROK (Medicine) · Physiology
During ventricular systole, the cardiac muscle does not respond to additional stimulation because it is in the phase of:
- A. Relational refractoriness
- B. Hyperexcitability
- C. Subnormal excitability
- D. Absolute refractoriness
- E. There is no correct answer
Hint
Think about the long plateau of the cardiac action potential and what it does to the ability of the muscle to respond to a second stimulus.
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