Question

which muscle is the agonist when bending (flexing) your elbow in an arm curl? * 1 point
a) triceps
b) biceps
c) quadriceps
d) hamstrings
if you were to extend (straighten) your arm at the elbow, which muscle would then become the agonist (primary mover)? * 1 point
a) triceps
b) biceps
c) quadriceps
d) hamstrings

Explanation:

An agonist is the muscle that is primarily responsible for a movement. When flexing the elbow in an arm - curl, the biceps contracts to perform the movement. When extending the elbow, the triceps contracts to straighten the arm and is the agonist. The quadriceps are in the thigh and are involved in knee - extension, and the hamstrings are also in the thigh and are involved in knee - flexion and hip - extension.

Answer:

1. B. Biceps
2. A. Triceps