When left atrial pressure exceeds left ventricular pressure is the bicuspid valve open?

Is the blood pressure in systemic arteries greatest during atrial systole or ventricular systole?

ventricular systole

When are the AV valves open?

when ventricular pressure becomes greater than atrial pressure

During which phase of the cardiac cycle do the ventricles of the heart contract?

There are many phases of the cardiac cycle- in total five stages occur. phase 1) - Isovolumetric ventricular contraction In response to ventricular depolarization, tension in the ventricles increases. The rise in pressure within the ventricles leads closure of the mitral and tricuspid valves. The pulmonic and aortic valves stay closes during the entire phase. 2) ventricular ejection: When ventricular pressure exceeds aortic and pulmonary arterial pressure 80MMHG- the aortic and pulmonic valves open and the ventricles eject 70% of the blood. 3) Isovolumetric relaxation: when ventricular pressure falls below pressure in the aorta and pulmonary artery, the aortic and pulmonic valves close. All valves are closed during this phase. Atrial diastole occurs as blood fills the atria.4) ventricular filling: atrial pressure exceeds ventricular pressure which causes the mitral and tricuspid valves to open. Blood then flows passively into the ventricles. About 70% of ventricular filling takes place during this phase. 5) atrial systole: known as the atrial kick, atrial systole coinciding with late ventricular diastole supplies the ventricles with the remaining blood for each heart beat. Diastole: This occurs in-between heartbeats to allow blood to refill the heartSystole: when the atria and ventricles contact For more information e-mail me: Elliottcollins@hotmail.co.uk I also have a VERY helpfull link belowHow_heart_works

What happens to the volume of blood in the ventricle during the period of isovolumetric contraction?

Both ventricular contraction and atrial diastole take place.

Which would produce the most life-threatening condition atrial flutter ventricular flutter atrial fibrillation or ventricular fibrillation?

Ventricular fibrillation, since this pumps blood to the rest of the body.

What is the difference between heart rate and ventricular rate?

On an ECG the heart rate will match both ventricular rate and atrial rate if the heart is normal. If people have atrial fibrilation then the ventricular rate will be used on the ECG to work out the rate of the ventricular contraction and vice-versa with ventricular fibrilation. Usually both atrial and ventricular rates match so if the atria contracts at 70 BPM the ventricles will beat at 70 BPM. It is possible for the ECG machine to work out atrial or ventricular rate if needs be. Usually, however, if the ECG machine just displays heart rate then both ventricular and atrial rates match.

Is systolic pressure where the ventricls are relaxing?

Relaxation = Diastole Contraction of the atria=Atrial systole Contraction of the ventricles = Ventricular systole

During atrial systole 70 percent of ventricular filling occurs?

No. Most (~70%) of ventricular filling occurs passively, without atrial contraction.

Does the p wave in an ekg indicate atrial depolarization?

No it does not. Atrial repolarization is generally not visible on the telemetry strip because it happens at the same time as ventricular depolarization (QRS complex). The P wave represents atrial DEpolarization (and atrial systole). Atrial repolarization happens during atrial diastole (and ventricular systole).

Which wave length is larger atrial contraction or ventricular contraction?

the ventricular contraction wave is larger

What are the major types of arrhythmia?

Atrial Fibrillation, Ventricular tachycardia, Ventricular fibrillation, Supraventricular tachycardia

Which wave is larger the one for atrial contraction or the one for ventricular contraction?

Ventricular contraction wave is larger