Heart of Pigeon
Heart lies in the pericardium and situated in the thoracic cavity.
The auriecles comparatively thick walled and are situated in front of the ventricles. The inner surfaces of auricle are raised in to muscular ridges. The right auricles receive deoxygenated blood from the body through the two precaval and are post cavalla. The left auricle gets ozygenated blood from the lungs through the four pulmonary veins. The right and left aurieles open into the right respectively through the two auriculo-ventrricular aperture.
Ventricles are two in number, completely separated, so that there is no mixing of the ozygenated and deoxygenated blood in to the ventricle. The left ventricle is larger and more muscular than the right ventricle.
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From the right ventricle originates the pulmonary artery and from the left ventricle arises the aortic arch.
The right auriculo-ventri-cular aperture is guarded by a single large muscular flap like valve. However the left auricle from the left ventricles is separated by the two valves. The opening of the aorta is guarded by semi lunar valves.
The deoxygenated blood from the body reaches the right auricle through the right pre-caval, left pre-vaval. Contraction starts of S-A-node.
Heart of Rabiit
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Heart is enclosed with in the pericardium and placed in the thoracic cavity.
Heart is enclosed with in the pericardium, and placed in the thoracic cavity. The auricles are comparatively thick walled. They lie in front the ventricular inner surfaces of the auricles are provided with muscular ridges. The inter-auricular septum possesses a fossa ovalis. The right auricle receives deoxy genated blood from the body through the anterior and posterior vanacavae. The left auricle gets oxygenated blood from the lungs through four pulmonary veins. Both the auricles have auricular appendices. The right and left auricles open into the right and left ventricles respectively through the auriculo ventricular aperture.
Ventricles are 2 in number and are completely divided. Left ventricle is heavier than the right one.
From the right ventricle springs the pulmonary artery to lungs and from the left ventricle originates a carotico-systemic aorta, which curves to the left side to form dorsal aorta. No corresponding arch on the right side is found.
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The right auriculo-ventricular aperture is guarded by tricuspid valve and left by bicuspid valves. The openings of both the aorta are guarded by three semilunar valves.
The deoxygenated blood from the body reaches the right auricle through two vanacavae. Left auricle receives ozygenated blood from lungs. The auricle contracted and deoxygenated blood from the right and oxygenated blood from the left reaches right and left ventricles through the auriculoventricular aperture.