FIG. 2.
(A) Myogenic (spontaneous) tone, (B) TxA2-induced tone of rat intramural coronary arterioles as a function of intraluminal pressure. Values from the control angiotensin II-treated group (AII; full circles, n = 11), ovariectomy (OVX; empty circles, n = 11), and estrogen-treated (full triangles, n = 11) groups are shown. Mean ± SEM values. Asterisk indicates statistical significance (P < 0.05) between control AII and estrogen-treated groups versus OVX group. Spontaneous myogenic tone was higher in the estrogen-treated group compared with the ovariectomized group. There was no difference in U46619-induced tone between the groups.