during ventricular contraction the AV remain? and during ventr. relaxation the AV remain?

I presume you mean the AV node, or atrioventricular node.
The AV node is a bundle of cell that act to communicate the electrical fad from the atria (upper chambers of the heart) to the ventricles: AV, how totally appealing!
The tissue remains present. Once, however, the signal is transmitted to the bundle branches that carry it to the lower chamber of the heart (ventricles), the AV node goes into a refractory period--it spends a brief time of year of time unwilling to transmit any further signals. Thus, though it remains, during a portion of the ventricular contraction (ventricular systole), it is comparatively inactive.
During the relaxation (diastole) the AV node does, as you would expect, remain present--but it's actively waiting for the signal from the sinoatrial (SA) node to reach it.
Doe sthat clarify?
i ruminate u are talking just about the AV valves right capably during ventricular contraction the AV valves are closed so that pressure is built up inwardly the ventricles and the blood can be pumped at a high pressure through the semilunar valve and so there is no reflux of blood into the atria and this is wat cause the 1st heart sound but during ventricular relaxation they are open to allow for receptive wadding of the ventricles by blood from the atria
i hope this answers your question

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