Action of progesterone on contractile activity of isolated gastric strips in rats

Table 1 Effect of progesterone on the resting tension of gastric smooth muscle in rats

Progesterone µmol·L-1	Resting tension/g
	Fundus	Body		Antrum		Pylorus
	LM	LM	CM	LM	CM	CM
5	-0.08 ± 0.12a	-0.008 ± 0.08	0	0.01 ± 0.05	0	0
10	-0.08 ± 0.08b	-0.05 ± 0.11	-0.03 ± 0.06	0.04 ± 0.09	0	0
50	-0.09 ± 0.06d	-0.12 ± 2.0a	0.01 ± 0.15	0.02 ± 0.04	0	-0.03 ± 0.10

The values were expressed as differences in resting tension between 3 min before and after the addition of progesterone (5, 10 and 50 µmol·L^-1) (The same in Tab 2). The resting tension of each strip in control (progesterone 0 µmol·L^-1) was 1. LM: Longitudinal muscle; CM: Circular muscle. x^-± s, n = 12,

^aP < 0.05,

^bP < 0.01,

^dP < 0.001, vs control by paired t test.