renal control of circulation (midterm 2)

Question 1

what two curves define the renal system

Answer 1

the renal output of water and salt (increasing line) and the line of water and salt intake

Question 2

what occurs with renal control of blood flow

Answer 2

increased valve, increased arterial pressure, increased urinary excretion leads to decreased arterial pressure and increased cardiac output

Question 3

what is equilibrium of long term arterial pressure determined by

Answer 3

the degree of shift of the renal output curve or the level of the water and salt intake line

Question 4

what do kidneys do to maintain arterial pressure

Answer 4

they will act to excrete water and salt until arterial pressure is reestablished

Question 5

what does salt do

Answer 5

elevates arterial pressure
- increased salt = increased body fluid osmolality = thirsty and increase in bodily water volume

Question 6

what could increased salt cause

Answer 6

hypertension - reduction of kidney mass reduced the ability of the kidney to remove salt, thus increasing arterial pressure (renal function curve shifts to right)

Question 7

what is renin

Answer 7

a small protein produced by the kidneys and released in response to a fall in arterial pressure

Question 8

how does the renin-angiotensin system work

Answer 8

renin is released and forms angiotensin I usign angiotensinogen. Angiotensin II is formed by cleave of I. II is a powerfukl vasoconstrictor.
maintains arterial pressure in response to significant changes in salt intake until ang II is inactivated by angiotensinase