Fentanyl is in a class of drugs called opioid analgesics, which work by binding to nervous system proteins called opioid receptors, thereby blocking the transmission of pain signals to the brain.Duragesic is a transdermal (through-the-skin) patch.entanyl skin patches are only used to treat people who are tolerant (used to the effects of the medication) to narcotic pain medications. Fentanyl is in a class of medications called opiate (narcotic) analgesics. It works by changing the way the brain and nervous system respond to pain.
Answers. Best Answer: 1 anisogamy (reproduction by the union or fusion of two differing gametes (especially differing in size) 2 Gonad is the generic term for either testes or ovaries 3 Gametes are haploid 4 Disease and disorders are passed on.
Cysts are very common abnormalities that can occur in people of any age. There are literally hundreds of different types of cysts, and they may arise through a variety of mechanisms. Defects in embryonic development can result in cysts that are present from birth. Normal wear and tear or small blockages in the flow of body fluids can also result in cyst formation.