one side of a membrane pulls water from the other side Hydrostatic Pressure

One side of a membrane pulls water from the other

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one side of a membrane pulls water from the other side Hydrostatic Pressure blood pressure that forces water out of the capillaries into the interstitial space Oncotic Pressure pressure exerted by the concentration of solutes on one side of a membrane pulls water from the other side Effective Arterial Blood Volume EABV- amt of blood in the arterial space to effectively perfuse organs/tissue. Changes in ECF will cause this to change. Decrease ECF vol. = EABV decrease. Antidiuretic Hormone A relatively small (peptide) molecule that is released by the pituitary gland at the base of the brain after being made nearby (in the hypothalamus). In response to a water deficit, sodium excess or low BP. ADH has an antidiuretic action that prevents the production of dilute urine (and so is antidiuretic). ... ADH is also known as vasopressin. Kidneys reabsorb water = more plasma volume Renin Angiotensin Aldosterone System a hormone system that regulates blood pressure and fluid balance. ... This increases the volume of extracellular fluid in the body, which also increases blood pressure. It is activated by low blood volume, renin converts to angiotensinogen to angiotensin I – water is retained = less urine = increases blood vol. Natriuretic Hormones Released from the atria or ventricle of the heart they work opposite of RAAS to decrease blood volume, promote urine excretion of NA+ and H2O (ANP & BNP) Tonicity relative concentration of solute; ability of a solution to cause a cell to gain or lose water Isotonic equal in concentration of solute molecules Hypotonic having a lesser concentration of solute molecules –
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c.Evaluate the purpose, function and role of hydrostatic and oncotic pressure and describe the mechanisms by which they are altered.
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