A teenager would be the correct answer
Answer:
Can show what you need to work on.
Explanation:
the answer is a i hope this helps you out
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.