Small cubage and large filling capacity make rubber stopper difficult to drift when washing, one another extrude and attrite, bring badly rubber scurfs and bad washing.
The total volume may be closer to 110 ml, and 70ml is the fraction that got ejected out with each beat, the other 40ml kind of lingers in the left ventricle until the next beat, right?
This reduction is especially noticeable in the first second of air breathed out in a single breath, called FEV1—forced expiratory volume (in one second), which typically is reduced even more than the FVC.
In a grown adult, the bladder can expand to hold about 750ml, slightly less in women than men because the uterus takes up space which crowds out the bladder a little bit.
It's only by working together and using both the bulk flow and simple diffusion of oxygen that they can make possible the process of cellular respiration.