Sequences of Rhythmic Behavior, Such as Backward Walking in the Crayfish

Multiple Choice

Sequences of rhythmic behavior, such as backward walking in the crayfish and swimming in the leech, rely on

A) the motor cortex section of the invertebrate brain.
B) repeated activity of the environmental stimulus that triggers the response.
C) specialized sensory receptors that detect body position.
D) specialized circuits called central pattern generators.
E) specialized motor neurons that innervate multiple muscle fibers.