Quiz Week 6 Flashcards
diffusion
movement of solutes or gases
move from areas of higher concentration to areas of lower concentration to reach equilibrium
example of diffusion
O2 and CO2 in alveoli diffuse to pulmonary capillaries
osmosis
movement of fluids (water)
from areas of lower solute concentration to areas of higher solute concentration to reach equilibrium
example of osmosis
sodium pulls water through nephrons
filtration
fluid
passes through permeable membrane
from areas of high pressure to areas of low pressure
example of filtration
blood through capillary walls
where is aldosterone secreted?
adrenal glands
where is ADH secreted?
made in hypothalamus
stored/released from posterior pituitary gland
where are natriuretic peptides secreted?
ANP - atria
BNP - ventricles
what stimulates the secretion of aldosterone?
decrease in BP and increase in K+
what stimulates the secretion of ADH?
decrease in BP/blood volume
or
increase in blood osmolality
what stimulates the secretion of natriuretic peptides?
stretching of cardiac atria/ventricles
What are the effects of aldosterone?
increases resorption of sodium in kidneys (water follows)
causes increase in blood volume/pressure
what are the effects of ADH?
increases water resorption in nephrons
constricts arteries
what are the effects of natriuretic peptides?
increase Na+ excretion (with water)
lowers BP
