Fig. 8. Chorioallantoic membrane mean arterial pressure
(
a) and heart rate
(fH) before (open bars) and after (closed bars) injection
of phenylephrine (120 µg kg1) in 80% and 90% embryos
pre-treated with atropine (3 mg kg1). Notice that
phenylephrine has significant effects on pressure but no effects on heart
rate. Data are means ± S.E.M. (N=6). Asterisks
indicate a significant response to the drug (P<0.05).