Question

a muscle with fascicles that insert into only one side of the tendon is categorized as
parallel.
bipennate.
convergent.
unipennate.
circular.

Explanation:

In muscle - anatomy, a unipennate muscle has fascicles that insert into only one side of the tendon. Parallel muscles have fascicles parallel to the long axis of the muscle. Bipennate muscles have fascicles on both sides of the tendon. Convergent muscles have a broad origin and a narrow insertion. Circular muscles form rings around body openings.

Answer:

unipennate.