What is the role of the internodal atrial muscle cells?Multiple ChoiceTo act as pacemaker, generating new cardiac impulsesTo stimulate movement of the atrioventricular valvesTo carry cardiac impulses to areas of the atrial walls far from the SA nodeTo carry the cardiac impulse from the atrial muscle to the ventricular muscle

Choose all the functions of the sinoatrial node.Question 3Select one or more:a.to regulate atrial systole.b.The impulse wave travels throughout the muscle of the atria, causing the cells to contract.c.to act as the heart's pacemaker.d.The sinoatrial node generates an electrical pulses at intervals.

The atrioventricular node a. Is connected to specialized wide, fast conducting myocytes in the bundle of His and Purkinje fibres b. Delays impulses for about 200 ms, allowing time for atrial contraction to complete ventricular filling c. Is a band of fibrous connective tissue which separates the atria from the ventricles d. Conducts impulses rapidly allowing almost immediate activation of ventricular muscle

Choose all the functions of the atrioventricular node.Question 1Select one or more:a.causes all the tissue of the ventricles to contract almost at once. b.to regulate ventricular systole.c.sends out rapid impulses throughout the ventricular tissue, causing the cells to contract.d.Receives impulses from the sinoatrial node.

Which of the following is said to the be the pacemaker of the heart:The atrioventricular nodeThe semilunar nodeThe sinoatrial nodeThe Purkinje fibres

The right atriumMultiple Choiceis the location of the pacemaker cells of a normal heart.prevents blood flow from the left ventricle to the left atrium.prevents blood flow from the pulmonary artery to the right ventricle.prevents blood flow from the right ventricle to the right atrium.prevents blood flow from the aorta to the left ventricle.