Description : The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of (a) atrioventricular bundle (b) Purkinje system (c) sinoatrial node (d) atrioventricular node.
Last Answer : (b) Purkinje system
Description : The neurotransmitter agent that is normally released in the sinoatrial node of the heart in response to a blood pressure increase is (a) Acetylcholine (b) Dopamine (c) Epinephrine (d) Glutamate (e) Norepinephrine
Last Answer : Ans: A
Description : In the heart: a. excitation begins in the sinoatrial node b. excitation of the ventricle begins at the apex and spread to the base c. depolarization occurs from epicardium to endocardium d. all above
Last Answer : all above
Description : Digitalis slows the heart in congestive heart failure by: A. Increasing vagal tone B. Decreasing sympathetic overactivity C. Direct depression of sinoatrial node D. All of the above
Last Answer : D. All of the above
Description : What fibrous structure functions to anchor the atrioventricular valves in a closed position?
Last Answer : Need answer
Description : In a patient given a cardiac glycoside, important effects of the drug on the heart include which of the following? (a) Decreased atrioventricular conduction velocity (b) Decreased ejection time (c) Increased ectopic automaticity (d) Increased ectopic automaticity (e) All of the above
Last Answer : Ans: E
Description : Choose the antiarrhythmic drug which prolongs action potential, can aggravate atrioventricular block but not heart failure, and has broad spectrum utility in acute as well as chronic, and ventricular as well as supraventricular arrhythmias: A. Quinidine B. Amiodarone C. Mexiletine D. Diltiazem
Last Answer : B. Amiodarone
Description : Difference between node and internodes? -Biology
Last Answer : answer:
Description : What is the difference in a nodule and a lymph node?
Last Answer : hyper vascular lymph node
Description : Phase difference between a node and an antinode is A. 90° B. 45° C. 180° D. 360°
Last Answer : 180°
Description : In humans, blood passes from the post caval to the diastolic right atrium of heart due to (a) stimulation of the sino auricular node (b) pressure difference between the post caval and atrium (c) pushing open of the venous valves (d) suction pull.
Last Answer : (b) pressure difference between the post caval and atrium
Description : why is sino atrio node pace maker? -Biology