In the schematic diagram of an arm being a lever, rod 1 represents the humerus and rod 2 the radius and ulna. M is a block being supported by the ‘hand’. What are located at the positions indicated by p, q, r and s?

belongs to book: Examination Questions and Answers in Basic Anatomy and Physiology|Martin Caon|| Chapter number:19| Question number:48

waelhammad

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2022-10-22

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In the schematic diagram of an arm being a lever, rod 1 represents the humerus and rod 2 the radius and ulna. M is a block being supported by the ‘hand’. What are located at the positions indicated by p, q, r and s?

Effort (p), centre of mass of the radius and ulna (q), fulcrum (r) and load (s).
Fulcrum (p), effort (q), centre of mass of radius and ulna (r) and load (s).
Centre of mass of radius and ulna (p), effort (q), load (r) and fulcrum (s).
Fulcrum (p), centre of mass of radius and ulna (q), effort (r) and load (s)

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waelhammad

2022-10-22

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B: p is the fulcrum (the elbow joint); q is the effort (the insertion point of the biceps brachii tendon); r is halfway along the rod 2, so is the centre of mass of the radius/ulna.

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In the schematic diagram of an arm being a lever, rod 1 represents the humerus and rod 2 the radius and ulna. M is a block being supported by the ‘hand’. What are located at the positions indicated by p, q, r and s?

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