Question

what is the expected response to the triceps - jerk reflex?
multiple choice
flexion of the shoulder
flexion of the forearm
plantar - flexion
extension of the forearm

Explanation:

The triceps - jerk reflex is a deep tendon reflex. When the triceps tendon is tapped (stimulus), the triceps muscle (effector) contracts. The triceps muscle is responsible for extending the forearm at the elbow joint.

• Flexion of the shoulder is not related to the triceps - jerk reflex. The muscles involved in shoulder flexion are different (e.g., anterior deltoid, pectoralis major clavicular head).
• Flexion of the forearm is mainly due to the action of biceps brachii (a flexor of the forearm at the elbow), not the triceps.
• Plantar - flexion is the movement of the foot (pointing the toes), which is unrelated to the triceps - jerk reflex.

Answer:

Extension of the forearm