Description : Function of SA node is
Last Answer : Function of SA node is A. Muscular pain B. Contraction of lungs C. Uricotelic D. None of the above
Description : Choose the incorrect statement from the following (a) Sympathetic system increases rate of SA node (b) Sympathetic system causes constriction of coronary arteries (c) Sympathetic system causes increased motility of GIT smooth muscles (d) Sympathetic system causes constriction of sphincter in GIT
Last Answer : Ans: C
Description : Adrenaline directly affects on (a) SA node (b) β-cells of Langerhans (c) dorsal root of spinal nerve (d) epithelial cells of stomach.
Last Answer : (a) SA node
Description : The correct route through which pulse-making impulse travels in the heart is (a) SA node → Purkinje fibres → bundle of His → AV node → heart muscles (b) SA node → AV node → bundle of His → Purkinje ... fibres → heart muscles (d) AV node → SA node → Purkinje fibres → bundle of His → heart muscles.
Last Answer : (b) SA node → AV node → bundle of His → Purkinje fibres → heart muscles
Description : Rate of heart beat is determined by (a) Purkinje fibres (b) papillary muscles (c) AV node (d) SA node.
Last Answer : (d) SA node.
Description : Impulse of heart beat originates from (a) SA node (b) AV node (c) vagus nerve (d) cardiac nerve
Description : Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when (a) AV node receives signal from SA node (b) AV valves open up (c) Ventricular ... blood from atria (d) Semilunar valves close down after the blood flows into vessels from ventricles.
Last Answer : (d) Semilunar valves close down after the blood flows into vessels from ventricles
Description : When the nurse observes that the patient's heart rate increases during inspiration and decreases during expiration, the nurse reports that the patient is demonstrating a) sinus dysrhythmia. Sinus dysrhythmia ... occurs when the sinus node regularly creates an impulse at a faster-than-normal rate.
Last Answer : a) sinus dysrhythmia. Sinus dysrhythmia occurs when the sinus node creates an impulse at an irregular rhythm.
Description : Which of the following drugs depresses automaticity of SA node as well as ectopic foci, abbreviates action potential duration of Purkinje fibres, and slows atrioventricular conduction: A. Propranolol B. Lignocaine C. Procainamide D. Bretylium
Last Answer : A. Propranolol
Description : The following action of digoxin is responsible for beneficial effect in auricular fibrillation: A. Increased myocardial contractility B. Suppression of SA node C. Depression of A-V conduction D. Enhanced Purkinje fibre automaticity
Last Answer : C. Depression of A-V conduction
Description : The secondary pacemaker of the heart is known as the: a) AV node b) SA node c) Purkinje Bundle d) None of the above
Last Answer : ANSWER: A -- AV node