Table 1. Effects of different doses of substance P (SP). Average values of the motor response (mN·s⁻¹·mm⁻²) to SP of the longitudinal and circular muscle of the duodenum, jejunum and ileum of rabbits. In brackets it expresses in number of segments.

	Duodenum		Jejunum		Ileum
	L	C	L	C	L	C
SP 1 nmol/L	0.0±0.0 (8)	0.0±0.0 (13)	0.0±0.0 (10)	0.0±0.0 (11)	0.1±0.0 (9)	0.1±0.0 (11)
SP 10 nmol/L	0.0±0.0 (9)	0.0±0.0 (13)	0.0±0.0 (10)	0.0±0.0 (11)	0.0±0.0 (9)	0.0±0.0 (11)
SP 100 nmol/L	0.2±0.0 (9)	0.0±0.0 (13)	0.3±0.1 (10)	0.1±0.0 (11)	0.4±0.1 (9)	0.1±0.0 (11)
SP 1 μmol/L	0.1±0.0 (9)	0.0±0.0 (13)	0.2±0.1 (10)	0.1±0.0 (11)	0.4±0.1 (9)	0.1±0.0 (11)
SP 10 μmol/L	0.1±0.0 (8)	0.1±0.0 (12)	0.5±0.0 (8)	0.2±0.0 (10)	0.5±0.1 (8)	0.1±0.0 (10)