in an ECOG Abnormal depolarization of the atria would change the shape of the tr
ID: 3521414 • Letter: I
Question
in an ECOG Abnormal depolarization of the atria would change the shape of the tracing A) R-T interval B) P-R interval C) QRS complex D) P wave E) T wave 1. decreases heart rate by Parasympathetic nervous A) Increasing K+ conductance B) Reduces Ca2+ conductance. C) Delays time to threshold D) All of the above E) None of the above 2. system Most invertebrates have open circulatory systems in which A) Blood pumped from the heart to blood vessels empty into hemocel B) Hemolymph bathes tissues directly C) There is a limited rate of Oxygen transfer D) All of the above E) None of the above 3.Explanation / Answer
1) d all of the above
Abnormal depolarization of atria would change the shape of the p wave in an ecg tracing
P wave is associated with right and left atrial depolarization.The wave of atrial repolarization is invisible because of low amplitude.Normal p wave is 2.5mm tall.It id the first short upward movement.
QRS complex shows ventricular depolarization.ST shows ventricular repolarization.PR interval shows initial depolarization of atria to initial depolarization of ventricle.QT interval shows when ventricle depolarizes and repolarizes.
2)d all of the above
Parasympatheticn nervous system decreases heart rate by
Increasing potassium conductance as potassium conductance increases and there is extracellular efflux of potassium the heart rate decreases.calcium increases the heart rate so decreasing calcium conductance decreases heart rate. Time to threshold also decreases the heart rate.
3)d all of the above
In open circulatory system blood pumped from heart is emptied into body cavities called haemocoel.blood flow takes place through vacant sinuses.the blood flow takes much time and the rate of supply of oxygen is also low .Blood is known as hemolymph it bathes the tissues directly.
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