The sarcoplasmic reticulum (SR) of skeletal muscle cells is a convoluted structure composed of a variety of tubules and cisternae, which share a continuous lumen delimited by a single continuous membrane, branching to form a network that surrounds each myofibril.
Percocet is the brand name for the drug combination of oxycodone hydrochloride and acetaminophen. It is classified as a semisynthetic pure opioid agonist medication used for relief of moderate to moderately severe pain.
But the decision is also likely to result in higher prices for OxyContin, a time-release form of a narcotic called oxycodone, because it will not face generic competition. The decision by the F.D.A. came on the day when the patent for the original version of OxyContin was set to expire. That would have allowed generic producers to introduce their own version of the formulation.