Final answer:
The medical assistant is demonstrating nonverbal communication through her body language by standing with arms at her sides while facing the patient, which suggests attentiveness and openness.
Step-by-step explanation:
A medical assistant who stands facing the patient and holds her arms at her sides while she converses with the patient is demonstrating nonverbal communication. This type of body language is part of the interpersonal skills that are crucial in the healthcare setting. Standing with arms at the sides can indicate openness and attentiveness to the patient, contributing to a more comfortable and trusting environment.