Question

During the downward part of a bicep curl the elbow joint movement is ______, the muscle responsible for the movement is the ______, and the muscle action is ______.

Answer 1

During the downward part of a bicep curl, the elbow joint movement is extension, the muscle responsible is the triceps brachii, and the muscle action is eccentric lengthening.

Step-by-step explanation:

During the downward part of a bicep curl, the elbow joint movement is extension, where the angle between the forearm and upper arm increases. The muscle responsible for this movement is the triceps brachii, located on the back of the upper arm.

The triceps brachii contracts isometrically during this phase to control the descent of the forearm. The muscle action is eccentric, signifying a controlled lengthening of the muscle under load. This phase of the bicep curl is essential for a balanced workout, as it engages the antagonistic muscles (triceps) while providing resistance, contributing to overall muscle development and joint stability.