Which type of drugs kill pain by blocking impulses at specific receptor sites of the brain and spinal cord

Narcotic analgesics

Explanation:

Narcotic analgesics are medications that mimic the activity of endorphins, substances produced by the body in order to control pain. They are available by prescription only.

Narcotic analgesics are used to treat acute pain related to surgery and other medical procedures, as well as for chronic and breakthrough pain that is moderate to severe.

delegated (sometimes called enumerated or expressed) powers are specifically granted to the federal government in article i, section 8 of the constitution. this includes the power to coin money, to regulate commerce, to declare war, to raise and maintain armed forces, and to establish a post office.