Stimulus for renin angiotensin system?

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SUMMARY

The primary stimulus for the renin-angiotensin-aldosterone system (RAAS) during hemorrhage is the decrease in renal perfusion pressure detected by the afferent arteriole, which leads to the secretion of renin. Additionally, the macula densa detects a decrease in sodium chloride concentration, further influencing renin release. The RAAS system is complex and involves feedback mechanisms, including the role of atrial stretch receptors and beta-1 adrenergic receptors, which can modify circulating renin levels.

PREREQUISITES
  • Understanding of renal physiology, specifically renal perfusion and the role of the afferent arteriole.
  • Knowledge of the renin-angiotensin-aldosterone system (RAAS) and its components.
  • Familiarity with sodium chloride regulation by the macula densa.
  • Basic concepts of autonomic nervous system physiology, particularly beta-1 adrenergic receptors.
NEXT STEPS
  • Research the mechanisms of renal perfusion pressure and its impact on renin secretion.
  • Study the role of the macula densa in sodium chloride sensing and its effect on RAAS.
  • Examine the feedback mechanisms involving atrial stretch receptors in regulating renin levels.
  • Explore the pharmacological implications of beta-1 adrenergic receptors in the context of RAAS modulation.
USEFUL FOR

Students studying renal physiology, medical professionals interested in the mechanisms of the renin-angiotensin-aldosterone system, and anyone seeking to understand the physiological responses to hemorrhage.

sameeralord
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Hello everyone,

I have to write a simple essay about this,I know what to write but I'm stuck with the stimulus so can't start the essay. My textbook is so vague. I want to know the stimulus in a haemorrhage.

1. Is it the decrease in renal perfusion pressure detected by afferent arteriole that secretes renin.
2. Or decrease in sodium chloride deteced by the macula densa that stimulates it.

Thanks :smile:
 
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sameeralord said:
Hello everyone,

I have to write a simple essay about this,I know what to write but I'm stuck with the stimulus so can't start the essay. My textbook is so vague. I want to know the stimulus in a haemorrhage.

1. Is it the decrease in renal perfusion pressure detected by afferent arteriole that secretes renin.
2. Or decrease in sodium chloride deteced by the macula densa that stimulates it.

Thanks :smile:

If you have a decrease in renal perfusion, what does the macula densa "see". Does it see more or less sodium? That is how the kidney regulates RAAS.

You should note though, that the RAAS system is complex and requires lots of feed back modifiers. Atrial stretch receptors (barroreceptors) can also alter circulating renin levels.
 
have a look at beta 1 receptors in the autonomics section of any pharm text - and tie that in with the baroreceptor response bobz mentioned
 

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