The deltoid muscle can effectively contract through its entire ROM because of the upward rotation of the scapula,which serves to maintain tension in the deltoid muscle.If the deltoid loses tension,it becomes

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If the deltoid loses tension, it would not be able to effectively contract through its entire ROM, resulting in a decreased ability to generate force. This is an example of active insufficiency. Passive insufficiency refers to a muscle's inability to stretch over multiple joints, while noncontractile refers to tissue that does not have contractile properties, such as ligaments.

The Deltoid Muscle Can Effectively Contract Through Its Entire ROM