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.
Extensors are on the inside of the arm and help extend the arm outward. Flexors are at the back of the elbow and pull it closer to the body by bending the elbow. Biceps brachii: The large muscle of the upper arm flexes the arm and powerfully twists the forearm, turning the palm upward.