Skeletal muscle cells exhibit a phenomenon known as recruitment, in which the number of muscle cells recruited to contract is proportional to the strength of muscle contraction needed. In this way, we activate a few produce a small contraction to pick up a piece of paper, and we activate many fibers to produce a larger contraction to pick up a textbook. Would you expect to see recruitment in cardiac muscle tissue? Why or why not? One of the more common electrical abnormalities seen in the heart is a heart block, in which conduction is blocked or delayed along some part of the cardiac conduction system. Predict what you would see if a heart block were present in each of the following locations: a AV node: b Right or left bundle branches: c Purkinje fibers: