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How is heart contraction triggered?
Heart contraction is independent from neuronal stimulus (although it can be modulated by the autonomous nervous system). In the heart there are pacemaker cells that trigger by themselves the action potentials that start the muscle contraction. These cells are concentrated at two special points of the heart: the sinoatrial node (SA node) situated in the superior portion of the right atrium and the atrioventricular node (AV node) situated near the interatrial septum.
Q. What are the symptoms of congestive cardiac failure? Congestive cardiac failure is a progressive form of cardiomyopathy. The most classical symptom is fluid imbalance due to
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True or false, adaptations are the result of finding the best or only solution to a given problem a species faces.
what is the fate of corpus luteum if egg gets fertilised ?
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