Which of the following is true with respect to the electrical activity of the heart? in vertebrates, only cardiac cells in the sinoatrial node are capable of intrinsic electrical activity electrical activity spreads between adjacent cardiac cells through nerves acetylcholine released from parasympathetic nerves accelerates the pacemaker in mammals, atria are electrically connected to ventricles through the atrioventricular node
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It is responsible for generating the electrical impulses that cause the heart to beat. Show more…
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Which of the following statements is true? a. Stimulation by the vagus nerve slows the heart rate. b. Stimulation by the cardiac nerve slows the heart rate. c. Parasympathetic stimulation occurs through the vagus nerve. d. Both B and C are true.
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Select the FALSE statement regarding the conduction system of the heart. a. The Sinoatrial Node is a cluster of specialised autorhythmic cells in the wall of the right atrium, which undergo spontaneous depolarisations. b. Purkinje fibres are specialised muscles cells that conduct signals quickly to the ventricular myocardium. c. The Atrioventricular Bundle (Bundle of His) connects the Atrioventricular Node and the ventricles. It divides into the anterior and posterior bundle branches for each ventricle. d. The Atrioventricular Node is a cluster of specialised cells located in the interatrial septum, which transmits electrical signals after a slight delay, to the Atrioventricular Bundle (Bundle of His).
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