▁It ▁is ▁the ▁district ▁capital ▁of ▁B use ga ▁District , ▁Sim iy u ▁Region . ▁ ▁Transport ▁P aved ▁Tr unk ▁road ▁T 4 ▁from ▁M w anza ▁to ▁the ▁Ken ya ▁border ▁passes ▁through ▁the ▁town . ▁ ▁References ▁ ▁Category : Pop ulated ▁places ▁in ▁Sim iy u ▁Region <0x0A> </s> ▁The ▁ph ary n ge al ▁ref lex , ▁g ag ▁ref lex , ▁or ▁l ary n ge al ▁sp asm , ▁is ▁a ▁ref lex ▁contra ction ▁of ▁the ▁back ▁of ▁the ▁thro at , ▁ev oked ▁by ▁touch ing ▁the ▁roof ▁of ▁the ▁mouth , ▁the ▁back ▁of ▁the ▁tongue , ▁the ▁area ▁around ▁the ▁tons ils , ▁the ▁u v ula , ▁and ▁the ▁back ▁of ▁the ▁thro at . ▁It , ▁along ▁with ▁other ▁aer od ig est ive ▁ref lex es ▁such ▁as ▁ref lex ive ▁ph ary n ge al ▁sw allow ing , ▁prevents ▁objects ▁in ▁the ▁or al ▁cav ity ▁from ▁entering ▁the ▁thro at ▁except ▁as ▁part ▁of ▁normal ▁sw allow ing ▁and ▁helps ▁prevent ▁ch oking , ▁and ▁is ▁a ▁form ▁of ▁c ough ing . ▁ ▁Ref lex ▁arc ▁In ▁a ▁ref lex ▁arc , ▁a ▁series ▁of ▁phys i ological ▁steps ▁occur ▁very ▁rapidly ▁to ▁produce ▁a ▁ref lex . ▁Gener ally ▁a ▁sens ory ▁re ceptor ▁receives ▁an ▁environmental ▁stim ulus , ▁in ▁this ▁case ▁from ▁objects ▁reaching ▁n erves ▁in ▁the ▁back ▁of ▁the ▁thro at , ▁and ▁sends ▁a ▁message ▁via ▁an ▁af