NURS 331 Midterm 2 || All Questions Answered Correctly.

Conduction System of the Heart correct answers The SA (sinoatrial) node spontaneously generates impulses at a rate of 60-100bpm This stimulates the atria to contract and travel to the AV node The signal gets briefly held in the AV node and is then conducted through the bundle of His, Purkinje fibers and the ventricular epicardium If the SA node can't fire the AV junction will take over at a rate of 40-60bpm If both the SA and AV junction don't fire the ventricles generate an impulse at a rate of 20-40bpm Conduction correct answers SA Node: 60-80 BPM AV Node: 40-60 BPM Bundle of His: 40-60 BPM Right Bundle Branch: 20-40 BPM Purkinje Fibers: 20-40 BPM Bachmann's Bundle Left Bundle Branch Excitation and Relaxation correct answers Cardiac Cycle correct answers ECG correct answers ECG is also known as an electrocardiogram Provides a picture of the electrical conduction of the heart at a particular point in time A standard ECG is a 10-second strip A standard ECG has 12 leads with 10 electrodes ECG Leads correct answers Each lead is marked with a different color and lead number The right arm lead is white and marked RA The left arm lead is black and marked LA The right leg lead is green and marked RL