Cardiovascular effects of serotonin on the pigeonColumba livia
01 Apr 1984-Vol. 93, Iss: 3, pp 199-202
TL;DR: The effect of serotonin on the blood pressure and the heart rate of the pigeonColumba livia was investigated in anaesthetised condition and a reflex vagal activity and a direct vasoconstrictor activity were proposed on the action of serotonin.
Abstract: The effect of serotonin on the blood pressure and the heart rate of the pigeonColumba livia was investigated in anaesthetised condition. The effect of histamine was also investigated to understand the mechanism of action of serotonin. Serotonin and histamine were both depressors. Serotonin produced bradycardia while histamine produced tachycardia. Atropine treatment reversed the serotonin-induced depressor response but only partially blocked the histamine-induced fall in blood pressure. Atropine treatment completely abolished the serotonin-induced bradycardia but partially inhibited the histamine-induced tachycardia. A reflex vagal activity and a direct vasoconstrictor activity were proposed on the action of serotonin.
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01 Jan 1976
TL;DR: The heart of most birds is located in the thorax slightly to the left of the median line and is almost parallel to the long axis of the body, except that the apex may be bent to the right.
Abstract: The heart of most birds is located in the thorax slightly to the left of the median line and is almost parallel to the long axis of the body, except that the apex may be bent to the right. The heart is surrounded by the pericardial sac. The bird heart, like the mammal’s, has four chambers, two atria and two ventricles. The right atrium is usually larger than the left. The left ventricle is usually three or more times larger than the right and is considerably thicker. The radii of curvature at the apex are less than at the base and therefore tension and pressure here are less. Avian cardiac muscle has no transverse tubules and the fibers are much smaller than mammalian ones (Sommer and Steere, 1969; Akester, 1971). The atria have openings into the ventricles which are closed by the atrioventricular (AV) valves. The left valve is thin, membranous, and bicuspid, as it is in mammals. The right valve is simply a muscular flap.
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"Cardiovascular effects of serotonin..." refers background in this paper
...Nothing definite can be said on the possible role ofcardiovascular chemoreceptor as its function is yet to be ascertained ( Magno 1973 )....
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TL;DR: In this paper, the effects of purified urotensin I (UI) from the Catostomus urophysis on arterial blood vessels were examined using isolated dorsal aortic strips from a bird, the chukar, Alectoris graeca.
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