Cocaine normally stays in the system for approximately 48 hours. Although the method of administration and the dose administered affects how long it takes for the body to metabolize this drug. When coca leaves are chewed, absorption time is around 30 minutes.
The muscles that provide the movement for the shoulder and upper arm include the anterior muscles in the front, the posterior muscles in the back, and the shoulder muscles that are sort of in between. Pectoralis major: This muscle has two heads, or sections of muscle tissue, and covers much of the front of the thoracic cage.
By Ground Up Strength. The muscles that move the hand are divided into two groups, the extrinsic and intrinsic muscles. The extrinsic muscles of the hand are the powerful flexor and extensor muscles of the forearm. These muscles originate outside the hand and insert within the hand. Since they are located and originate on the forearm outside the hand itself, they are called extrinsic which comes from the Latin word extrinsecus meaning on the outside.