(a)[1]
Arrange the letters in the right order for a reflex action. Two have already been completed for you.
(b)[4]
Describe how impulses are transmitted from one neurone to another across a synapse.
(c(i))[3]
Outline the short-term effects of heroin on the body.
(c(ii))[2]
State two withdrawal symptoms that heroin users may experience.
(c(iii))[1]
Suggest why heroin abuse may increase criminal activity.