Question

which of the following is a pennate muscle?
biceps brachii
pectoralis
rectus abdominis
rectus femoris
supinator

Explanation:

Pennate muscles have a feather - like arrangement of fibers. The rectus femoris is a bipennate muscle (a type of pennate muscle). The biceps brachii is a fusiform muscle. The pectoralis major has a convergent arrangement. The rectus abdominis has a parallel arrangement. The supinator has a unipennate - like but more complex arrangement compared to the clear bipennate nature of rectus femoris.

Answer:

rectus femoris