In many countries, PAP machines are only available by prescription. A sleep study at an accredited sleep lab is usually necessary before treatment can start. This is because the pressure settings on the PAP machine must be tailored to a patient's treatment needs.
The pectoralis major muscle also performs internal rotation -- turning your arm in toward your body. This action, also called medial rotation, is important for reaching behind your back to tuck in your shirt and combing your hair on the opposite side of your head.
What is the function of the humerus? The function of the humerus is to anchor the major muscles that move the shoulder and elbow. There are a number of muscles that attach to the humerus bone, including the pectoralis major and deltoid, which makes it an essential bone for arm and shoulder movement. Full Answer >.