Beta-blockers are a class of drugs that act as adrenergic antagonists. beta-blockers will have an effect at

Sympathetic target organs

Explanation:

Beta blockers are also called as beta-adrenergic blocking medications. It reduces the blood pressure. It functions on the hormone epinephrine that is also called as adrenaline. It's action is on the sympathetic target organs like heart. The beta blockers can cause the heart to beat slowly and with the less force, which actually lowers the blood pressure.

for question 8

1: it gets the blood pumping more

2: endorphins and other neurotransmitters

creating amino acids is the answer