Study Guide Key for ANA 110 Unit 1 PDF

Label the key events on the EKG tracing : P Wave, QRS Segment, T wave Describe the three main components of the EKG: P Wave: Atrial Depolarization QRS: Ventricular Depolarization [*Atrial Repolarization hidden within QRS Complex] T wave: Ventricular Repolarization Describe the one word definitions...

Label the key events on the EKG tracing : P Wave, QRS Segment, T wave Describe the three main components of the EKG: P Wave: Atrial Depolarization QRS: Ventricular Depolarization [*Atrial Repolarization hidden within QRS Complex] T wave: Ventricular Repolarization Describe the one word definitions of the following terms: Diastole = Relaxation; Systole = Contraction Describe the electrical, muscular & heart valve events of the following periods of the cardiac cycle: **I have provided the same information in both chart & paragraph forms - use whichever works best for you:) Atrial Diastole: Atrial Relaxation As the atria relax, the volume of the atria increases, causing the pressure to decrease. The myocardium of the ventricle is relaxed and therefore there is no change in the ventricular volume or pressure. The AV valve is close to allow for atrial filling with blood from pulmonary & systemic veins. The SL valve is also closed. There is no heart sound associated with atrial diastole. Atrial relaxation corresponds to & is embedded within the QRS Complex on an EKG. Atrial Systole: Atrial Contraction As the atria contract, the volume of the atria decreases, causing the pressure to increase. The pressure in the aorta continues to increase until atrial pressure becomes greater than ventricular pressure, causing the AV valve to open. The SL valve is closed to allow for ventricular filling. The ventricles are relaxed. The volume of the atria is decreasing while the volume of the ventricle is increasing (blood is moving from atria to ventricle through the AV valve). Atrial systole is represented by the P Wave on an EKG. There is no heart sound associated with atrial systole. Ventricular Diastole: Ventricular Relaxation As the ventricles relax, the volume of the ventricle increases, causing the pressure to decrease. The pressure of the ventricle continues to decrease until the pressure in the aorta/pulmonary trunk is greater than ventricular pressure, causing the SL valves to close. This valve closure produces the S2 heart sound. Ventricular Diastole is represented by the T Wave on an EKG. The myocardium of the atria is relaxed, there is no change in pressure or volume within the atria. The AV valve is closed because the atrial pressure remains lower than the ventricular pressure up to a point in ventricular diastole when the pressure of the atria becomes greater than the pressure within the ventricle, causing the AV valve to open.