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.
Sports Medicine. The one arm dumbbell row is a good addition to any dumbbell workout. This movement targets the upper and lower back, shoulders, biceps and hips, while improving core stability. The main muscle group worked during the single arm row is the latissimus dorsi (lats).