The client asks how atenolol (Tenormin) helps angina. The response provided by the nurse is based on

The client asks how atenolol (Tenormin) helps angina. The
response provided by the nurse is based on which concept? This medication:

1. Slows the heart rate and reduces contractility.

 2. Increases the heart rate and diminishes contractility.

 3. Blocks sodium channels and elevates depolarization.

 4. Decreases blood pressure and blocks the alpha 2
receptors.