Nerve impulses in neurones may move: 1 away from the central nervous system, 2 towards the central nervous system, 3 inside the central nervous system. In what direction do impulses travel in sensory neurones and relay neurones?
- Asensory neurone 1; relay neurone 2
- Bsensory neurone 1; relay neurone 3
- Csensory neurone 2; relay neurone 1
- Dsensory neurone 2; relay neurone 3