BIOL 3070 Lecture Notes - Lecture 3: Mitral Valve, Tricuspid Valve, Pulmonary Vein
Document Summary
Mammalian heart; structure and function: contractile organ is known as the muscular heart, multiple chambers, contract to increase the pressure. The pressure build up by going from one chamber to another: multiple chambers allows increasing in pressure, where the chambers are connected together, the flow of blood is unidirectional. Examples: tilios fish: 2 chambers non-separated, the first is atrial, and the second is ventricular chamber. The sv node contains the pacemakers unlike the mammals: frog: 3 chambers, two atrium and one common ventricle, reptile: 4 incomplete chamber heart, incomplete septum between the two ventricles. O(cid:373)e of the reptiles have the separatio(cid:374) a(cid:374)d so(cid:373)e do(cid:374)"t. Crocodile, complete divided ventricles, complete chambered heart. It is due to a transcription factor tbx 5, the expression of this factor would lead to the separation, in mammalians there are expression and absence of the factor.
