Place the labels in order denoting the sequence of events of the cardiac cycle b
ID: 55838 • Letter: P
Question
Place the labels in order denoting the sequence of events of the cardiac cycle beginning with passive ventricular filling. In order to get the correct sequence, you must start at "The entire heart exhibits resting membrane potential".
- End systolic volume is achieved as the heart enters relaxation
-Voltage-regulated fast-calcium and sodium channels open in the SA node
-The T-Wave appears on the EKG tracing
-The AV valves close
-Voltage-regulated potassium channels open in the myocytes of the ventricles
-Semilunar valves open
-Cations flow from the SA node to the adjacent cardiocytes through gap junctions
-Cells of SA node reach autorhythmic threshold
-Blood exits ventricles
-End diastolic volume is achieved as ventricular contraction begins
-P-wave appears on EKG
-Downward deflection (Q) seen on EKG tracing
-AV node depolarization occurs & transmits signal to the bundle branches
- The entire heart exhibits "resting" membrane potential
Explanation / Answer
-Voltage-regulated fast-calcium and sodium channels open in the SA node
-The T-Wave appears on the EKG tracing
-The AV valves close
-Voltage-regulated potassium channels open in the myocytes of the ventricles
- End systolic volume is achieved as the heart enters relaxation
-Semilunar valves open
-Cations flow from the SA node to the adjacent cardiocytes through gap junctions
-Cells of SA node reach autorhythmic threshold
-P-wave appears on EKG
-Blood exits ventricles
-End diastolic volume is achieved as ventricular contraction begins
-Downward deflection (Q) seen on EKG tracing
-AV node depolarization occurs & transmits signal to the bundle branches
- The entire heart exhibits "resting" membrane potential