Nerve impulses in neurones may move: 1 out of the central nervous system 2 into the central nervous system 3 inside the central nervous system. In what direction do impulses travel in sensory neurones and in relay neurones?
- Asensory neurones 1, relay neurones 2
- Bsensory neurones 1, relay neurones 3
- Csensory neurones 2, relay neurones 1
- Dsensory neurones 2, relay neurones 3