Biology · Hormones - Adrenal Medulla
What effect do epinephrine and norepinephrine hormones have on cardiac muscle?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1They act directly to decrease blood pressure by relaxing muscle.
- 2They only increase heart rate without affecting contraction strength.
- 3They decrease cardiac excitability and contractility, lowering blood pressure.
- 4They increase cardiac excitability and contractility, raising blood pressure.✓
Correct answer
They increase cardiac excitability and contractility, raising blood pressure.
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