urinary 3 Flashcards
RAA
renin-angiotensin-aldosterone system
angiotensin
inactive plasma protein, not doing anything because theres no renin in the blood stream
-becomes angiotensin 1
angiotensin 1
proteins that acts as a precurser molecule for angiotensin 2
angiotensin 2
protein that acts directly on blood vessels for constriction and raising blood pressure
renin
enzyme that helps control your BP
release of renin triggers
cascade of activations resulting in angiotensin 2
how renin is secreted
many pathways but all start with decreased plasma volume (carries water, salts, enzymes)
aldosterone
balances the levels of sodium and potassium
detection of plasma volume
baroreceptors/stretch
detection of 0
osmoreceptors
ANP atrial natriuretic peptide
small peptide secreted by the heart when there is atrial stretch or high systemic blood pressure
plasma volume - osmolarity
decreased PV - Incresed O
increased PV- decreased O
osmolarity
the concentration of a solution expressed as the total number of solute particles per litre
ANP secretion leads to
- increased sodium excretion
- will increase urine output as water follows sodium, decreasing blood volume via plasma volume
-more filtration and secretion
- can also decrease the release of vasopressin
vasopressin/ antidiuretic
regulates blood pressure and increases reabsorption of water from the kidneys. conserving body water and defending against dehydration