One of the reasons Britain became rich was because the Industrial Revolution (factories and such) got off the ground there sooner. Britain had a large navy, and many colonies in other parts of the world, such as India, and Rhodesia.
Full Muscles of the Arm and Hand Description. The muscles of the upper arm are responsible for the flexion and extension of the forearm at the elbow joint. Flexion of the forearm is achieved by a group of three muscles â the brachialis, biceps brachii, and brachioradialis.uscles of the Arm and Hand. The muscles of the arm and hand are specifically designed to meet the bodyâs diverse needs of strength, speed, and precision while completing many complex daily tasks.
This movement is called âscapular elevation.â It uses the muscles Trapezius and Levator Scapulae. Another way to raise your arm is to lift it completely sideways. This movement is called âabduction.â When you do this you can actually only abduct your arm until it is straight sideways. The muscles used to get here were mostly Deltoid and Supraspinatus. Lastly, you can raise your arm by moving it forward in an action called âflexion.â Like abduction, you can only flex your arm until it is straight forward. The muscles used to get here were mostly Coracobrachialis and Biceps Brachii, although there was probably also a little help from Deltoid, and Pectoralis Major.