Transverse tubules. Tubules formed by invaginations of the sarcolemma and flanked by the sarcoplasmic reticulum. They carry action potentials deep into the muscle fiber. T tubules and SR provide tightly linked signals for muscle contraction.
Also known as Oxycodone, PercocetÂ® is in a group of drugs called narcotic pain relievers. Percocet Â® is a combination of an analgesic, colloquially known as a painkiller, an antipyretic, a drug used to lower the bodyâs temperature and a narcotic, a drug used primarily to induce sleep.
Heroin is an opioid drug made from morphine, a natural substance taken from the seed pod of the Asian opium poppy plant. Heroin can be a white or brown powder, or a black sticky substance known as black tar heroin. People inject, snort, or smoke heroin. Some people mix heroin with crack cocaine, called a speedball.