The Vascular System Flashcards
released by the kidneys in response to decreased perfusion
renin
Released by the liver and converted to angiotensin I by renin
Angiotensinogen
Activity unknown; converted to angiotensin II by ACE
Angiotensin I
Causes vasoconststriction, salt retention & vascular growth
angiotensin II
Angiotensin II stimulates the release of:
aldosterone
Decreased renal perfusion pressure leads to: (3)
- INCREASED renin release
- INCREASED renal sympathetic activity
- DECREASED glomerular filtration
What three scenarios lead to INCREASED renin release?
- Decreased renal perfusion pressure
- Decreased glomerular filtration
- Increased renal sympathetic nerve activity
Angiotensinogen acts on :
Angiotensin I
Angiotensin I is acted on by ____ to produce angiotensin II
ACE
What do ACE inhibitors decrease? What does this lead to?
ACE: No angiotensin II production
Angiotensin II acts on ____ receptors
AT1
What are the receptor antagonists for AT1 receptors?
Angiotensin II AT1 subtype receptor antagonists
What are the 3 effects of angiotensin II acting on AT1 receptors?
- vascular growth
- vasconstriction
- salt retention
Describe the vascular growth caused by angiotensin II:
- hyperplasia
- hypertrophy
Describe the vasoconstriction caused by angiotensin II:
- Direct
- Via increased noradrenaline release from sympathetic nerves
Describe the salt retention caused by angiotensin II:
- Aldosterone secretion
- Tubular Na+ resorption
AT1:
angiotensin 1 receptor