Control and coordination in mammals — practice question

Most reflex arcs pass through the spinal cord and include more than one type of neurone. Name and state the functions of the three neurone types in a spinal reflex arc.

Certain poisons interfere with synaptic function between neurones. Four organisms, $A$, $B$, $C$ and $D$, each produce a different poison that disrupts synapses. $A$ *Hapalochlaena lunulata*, the blue-ringed octopus $B$ *Conus textile*, the textile cone sea snail $C$ *Clostridium botulinum*, a bacterium $D$ *Physostigma venenosum*, the calabar bean plant Table 7.1 gives a summary of how the poisons from organisms $A$, $B$, $C$ and $D$ act.