Answer:
Actively insufficient
Explanation:
The deltoid is a muscle attached by tendons to the bones localized on the top of the shoulder (clavicle, scapula and humerus). The amount of force generated by a multi-joint muscle decreases as the muscle moves the joints simultaneously. A multi-joint muscle becomes actively insufficient when it shortens over both joints simultaneously and it no longer has the ability to develop an effective tension. Moreover, a muscle is passively insufficient when it can't be stretched to its fullest length across multiple joints simultaneously.
