21. (v15-120-6) Qichishish retseptoridagi qozgalishning yonalish ketma-ketligini korsating.
1) orqa miya; 2) harakatlantiruvchi nerv tolasi; 3) ishchi organ; 4) retseptor; 5) oraliq miyaning postloq osti markazi; 6) yarimsharlar postlogining orqa markaziy pushtasi;
7) yarimsharlar postlogining oldingi markaziy pushtasi; 8) sezuvchi nerv tola; 9) nerv markazi.
A) 4, 2, 9, 8,3 B)4, 8, <1,5, 6
C) 4, 8, 1,5, 7
D) 4, 8, 5, 7, 2, 1,3