3. In the Iron Cross Problem, what class of lever is represented in this problem

Question

3. In the Iron Cross Problem, what class of lever is represented in this problem? 4. In the Iron Cross Problem, what is the length of the moment arm for the Teres Major muscle? In the Iron Cross Problem, determine the moment produced by the Teres Major muscle using (1) the calculated moment arm, and (2) the definition of a cross product method. NOTE: You should calculate the Teres Major moment in two different ways; both ways should produce the same result. 5. 6. Certain types of dinosaurs were bipedal (walked on two legs). What is a good reason that these creatures invariably had long tails if they had long necks?

Explanation / Answer

Answer3. Iron cross problem- iron cross position is standing the body with outstretched arms. In iron cross problem there is lack of shoulder stabilisation and external rotation. Iron cross is used in a type of exercise. There is class 1 type of lever in iron cross. In this class of lever fulcrum is between the load and effort.

Answer 4. Teres major muscle is main muscle involved in iron cross. It originates from inferior angle and inserted on scapula. Main function of this muscle is extension, internal rotation and adduction. The approximate length of one teres major muscle is 10 cm. In iron cross it will be 20 cm in outstretched arms.

Answer 5. Movement produced by teres major muscle is extension, internal rotation and adduction around the shoulder joint.

Answer 6. In bipedal types of dianosours, there in invariably long neck and in order to provide balance while walking on two leg, their tail also get elongated to provide proper support. This occurred over a long evolution process.

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