Question

the rectus femoris is an example of what muscle shape?
fusiform
parallel
triangular
elongated
pennate

Explanation:

The rectus femoris is a bipennate muscle. Bipennate muscles have fibers that are arranged on both sides of a central tendon, similar to the structure of a feather. This is characteristic of pennate muscles. Fusiform muscles (e.g., biceps brachii) are spindle - shaped. Parallel muscles (e.g., sartorius) have fibers that run parallel to each other. Triangular muscles (e.g., deltoid) have a triangular shape. Elongated is a very general term and not a specific muscle - shape classification like the others.

Answer:

Pennate