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atrial natriuretic peptide
ANP acts to reduce the water, sodium and adipose loads on the circulatory system, thereby reducing blood pressure. ANP has exactly the opposite function of the aldosterone secreted by the zona glomerulosa.
It inhibits release of renin from the kidneys and of aldosterone from the adrenal cortex. The result is increased excretion of sodium ions and water from the kidneys and lowered blood volume and blood pressure. Or what you might be looking for is all of the above. :)
atrial natriuretic peptide
By secreting Atrial Natriuretic Peptide hormone.
When the walls of the atria are stretched by increased blood volume or blood pressure, the cells of the atria produce ANP (atrial natriuretic peptide). ANP's main function is to decrease the reabsorption of sodium ions (by the kidneys) in order to increase the elimination of water (in urine), and decrease blood volume and blood pressure. I'm not sure how much you've studied as far as the endocrine system goes, but it's basically the antagonist to the hormone Aldosterone.
It would be half of the original volume. As you reduce the volume the pressure would increase and at half the original volume the pressure would be doubled.
To increase the volume of a gas * reduce the pressure, or * increase the temperature, or * add more gas
Atrionatriuretic Factor (ANF) is released from atrial cells in response to increased blood volume. It acts to increase the excretion of sodium by the kidneys in order to reduce extracellular fluid volumes and decrease blood volume.
The volume, in this case, will reduce by a factor of 4 (i.e., to 1/4 of its previous volume).
Both ventricular contraction and atrial diastole take place.
Pressure in a glass can be reduced by either decreasing the amount of the gas in a finite space, or by increasing the volume of the finite space.