The answer to this question is the drug "Beta-1 Adrenergic" which is also known as ADRB1. It is a certain drug that affects and decreases the heart rate by simply blocking a receptor on cardiac pacemaker cells. This drug also probably binds to Beta-1 Adrenergic.
Answer : Fight off diseases
I would say that the answer(s) are 1), 2), 4), and 5). Not 3) because the risk is probably high not low.
Hope I helped,
Ms. Weasley
I would recommend googling it. but maybe it's of older body cells. no clue tho
