Blocked, and the heart can't get oxygen.
<span>The correct answer is D. The US Food and Drug Administration examines many different substances and approves them when their benefits outweigh the risks. To be approved, manufacturers must prove to the FDA that their product is both safe and effective, so if the drug is ineffective, it is unlikely that the FDA will approve it.</span>
Well here's one, hope it helps.(:
parkinson's disease.-
medications:
Levodopa
Dopamine Agonists
MAO-B inhibitors
COMT-inhibitors
Anticholinergics
Amantadine
surgeries:
deep brain stimulation (DBS)
