Drugs known as beta blockers are commonly used to treat hypertension. Given their name, what would you hypothesize is their method of action (be specific)?

Blocking $\beta$ adrenergic receptors
Cardiac nerves are able to control heart rate by releasing adrenaline and noradrenaline into $\beta$ receptors located in the nervous sinuses of the heart. These substances affect the heart rate by increasing its intensity and speed, which eventually increases blood pressure.