The parts of a reflex arc are illustrated in the flow diagram. receptor $\rightarrow$ sensory neurone $\rightarrow$ synapse $\rightarrow$ relay neurone $\rightarrow$ synapse $\rightarrow$ motor neurone $\rightarrow$ effector Which component is responsible for making sure that nerve impulses travel in one direction only?
- Amotor neurone
- Breceptor
- Csensory neurone
- Dsynapse