Also, of importance in maintaining the blood flow are the presence of atrial volume receptors.
2.
These glands excrete the hypertonic sodium-chloride ( with few other ions ) by the stimulus of central and peripheral osmoreceptors and volume receptors.
3.
The low-pressure baroreceptors, are found in large systemic veins, in pulmonary vessels, and in the walls of the right atrium and ventricles of the heart ( the atrial volume receptors ).
4.
Baroreceptors can be divided into two categories based on the type of blood vessel in which they are located : high-pressure arterial baroreceptors and low-pressure baroreceptors ( also known as cardiopulmonary or volume receptors ).
5.
NASA have found the same effect and has explained it more fully alone the lines ( from what I remember ) that as the blood is pushed out of the limbs and into the trunk by the water pressure, the blood volume receptors ( in the trunk ) modify a somewhat complex negative-feed-back-system involving the hormonal balance and that causes the kidneys to increase the production of urine.