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Unformatted text preview: 14:125:208: Introduction to Biomechanics Spring 2007 Homework Assignment #3 Due 2/15/07 Problem 1: (Anatomical Terms) 1) The ______ plane divides the body into right and left halves. A) transverse B) sagittal C) coronal D) oblique E) para-sagittal 2) The armpit or axilla is __________ to the hip. A) superficial B) deep C) superior D) inferior 3) The "6-pack of abs" is due to the rectus abdominis muscle that lies within the _______ abdominal wall. A) anterior B) posterior C) superior D) inferior 4) The big toe or hallux (otherwise known as the piggie that went to market) is _______ to the piggie that went wee-wee-wee all the way home (the little toe). A) medial B) intermediate C) lateral D) median 5) The arm is _________ to the hand. A) medial B) lateral C) proximal D) distal 6) The scapula (shoulder blade) is _________ to the vertebral column. A) anteromedial B) posterolateral C) proximal D) distal 7) The leg is _________ to the knee. A) medial B) lateral C) proximal D) distal 8) Supination of the arm requires the use of the following muscles: A) pronator teres B) biceps brachii C) brachioradialis D) brachialis E) triceps brachii F) Supinator 9) Arm curls work out all of the following muscles except: A) coracobrachialis B) biceps brachii C) brachioradialis D) brachialis 10) In the anatomical position, wrist flexion moves the hand _________. A) posteriorly B) laterally C) medially D) superiorly E) anteriorly 14:125:208: Introduction to Biomechanics Spring 2007 Homework Assignment #3 Due 2/15/07 Problem 2: (Elbow forces required for lifting) Using the three sets of anthropometric data taken in HW 2, determine the muscle force, M , and the elbow joint reaction force, R for the forearm in i) the horizontal position , and ii) when it is dropped 30 degrees from the horizontal . You can assume that for all subjects, the bicep is attached 2 inches from the elbow joint along the forearm and 4 inches from the shoulder joint along the humerus. The proximal (humerus) end of the bicep is inserted so that it is directly above the elbow joint (point R), and the muscle passively stretches to accommodate the length change as the elbow is extended. The hand is fully extended, and the edge of the ball is always at the end of the fingertips, such that the center of the ball remains 2 inches from the end of the fingertips. Do not ignore the weight of the arms in your analysis. In general, how do the differences in the anthropometric data you have taken affect the reaction forcers (a few sentences, please)? Some things to consider in your analysis and/or answer: What masses contribute to the bicep force? How significant are changes in humerus length among subjects to the reactions (what changes in the problem with humerus length)?...
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