Cardiac Output Regulation

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Questions and Answers

What is the primary goal of regulating cardiac output?

  • To maintain adequate blood flow and oxygen delivery to tissues (correct)
  • To increase stroke volume
  • To maintain a constant heart rate
  • To regulate blood pressure

Which part of the autonomic nervous system decreases cardiac output?

  • Sympathetic nervous system
  • Parasympathetic nervous system (correct)
  • Somatic nervous system
  • Enteric nervous system

What is the effect of increased heart rate on cardiac output?

  • Has no effect on cardiac output
  • Increases cardiac output (correct)
  • Decreases stroke volume
  • Decreases cardiac output

What is the role of baroreceptors in cardiac output control?

<p>To detect changes in blood pressure (D)</p> Signup and view all the answers

Which of the following hormones increases cardiac output?

<p>Epinephrine (A)</p> Signup and view all the answers

What is the role of the renin-angiotensin-aldosterone system in cardiac output regulation?

<p>To regulate blood pressure and volume over a longer period (B)</p> Signup and view all the answers

Which of the following factors does not affect cardiac output?

<p>Body temperature (C)</p> Signup and view all the answers

What is the effect of increased contractility on cardiac output?

<p>Increases cardiac output (B)</p> Signup and view all the answers

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Study Notes

Cardiac Output Control

Regulation of Cardiac Output

  • Cardiac output (CO) is regulated to maintain adequate blood flow and oxygen delivery to tissues
  • CO is controlled by the autonomic nervous system, which consists of:
    • Sympathetic nervous system (SNS): increases CO
    • Parasympathetic nervous system (PNS): decreases CO

Factors Affecting Cardiac Output

  • Heart rate (HR):
    • Increased HR increases CO
    • Decreased HR decreases CO
  • Stroke volume (SV):
    • Increased SV increases CO
    • Decreased SV decreases CO
  • Venous return:
    • Increased venous return increases CO
    • Decreased venous return decreases CO
  • Contractility:
    • Increased contractility increases CO
    • Decreased contractility decreases CO

Mechanisms of Cardiac Output Control

  • Baroreceptors:
    • Located in the walls of large arteries, particularly in the aortic arch and carotid sinus
    • Detect changes in blood pressure and send signals to the brain
    • Brain responds by increasing or decreasing SNS and PNS activity to regulate CO
  • Chemoreceptors:
    • Located in the carotid and aortic bodies
    • Detect changes in oxygen and carbon dioxide levels in the blood
    • Send signals to the brain to increase or decrease CO
  • Volume receptors:
    • Located in the atria and ventricles
    • Detect changes in blood volume and send signals to the brain
    • Brain responds by increasing or decreasing CO

Short-Term Regulation of Cardiac Output

  • Autonomic nervous system:
    • Rapidly adjusts CO in response to changes in blood pressure, oxygen levels, and other factors
    • Acts through the SNS and PNS to increase or decrease CO
  • Hormonal regulation:
    • Epinephrine (adrenaline) increases CO
    • Norepinephrine increases CO
    • Vasopressin (ADH) increases CO

Long-Term Regulation of Cardiac Output

  • Renin-angiotensin-aldosterone system (RAAS):
    • Regulates blood pressure and volume over a longer period
    • Activates the RAAS to increase CO and blood pressure
  • Atrial natriuretic peptide (ANP):
    • Released by the atria in response to increased blood volume
    • Decreases CO and blood pressure by reducing SNS activity and promoting vasodilation

Cardiac Output Control

Regulation of Cardiac Output

  • Cardiac output is regulated to maintain adequate blood flow and oxygen delivery to tissues
  • Autonomic nervous system (ANS) controls cardiac output, consisting of sympathetic (SNS) and parasympathetic (PNS) nervous systems
  • SNS increases cardiac output, while PNS decreases it

Factors Affecting Cardiac Output

  • Heart rate (HR) affects cardiac output:
    • Increased HR increases cardiac output
    • Decreased HR decreases cardiac output
  • Stroke volume (SV) affects cardiac output:
    • Increased SV increases cardiac output
    • Decreased SV decreases cardiac output
  • Venous return affects cardiac output:
    • Increased venous return increases cardiac output
    • Decreased venous return decreases cardiac output
  • Contractility affects cardiac output:
    • Increased contractility increases cardiac output
    • Decreased contractility decreases cardiac output

Mechanisms of Cardiac Output Control

  • Baroreceptors:
    • Located in large arteries (aortic arch and carotid sinus)
    • Detect changes in blood pressure and send signals to the brain
    • Brain responds by increasing or decreasing SNS and PNS activity to regulate cardiac output
  • Chemoreceptors:
    • Located in carotid and aortic bodies
    • Detect changes in oxygen and carbon dioxide levels in the blood
    • Send signals to the brain to increase or decrease cardiac output
  • Volume receptors:
    • Located in atria and ventricles
    • Detect changes in blood volume and send signals to the brain
    • Brain responds by increasing or decreasing cardiac output

Short-Term Regulation of Cardiac Output

  • Autonomic nervous system rapidly adjusts cardiac output in response to changes in:
    • Blood pressure
    • Oxygen levels
    • Other factors
  • Autonomic nervous system acts through SNS and PNS to increase or decrease cardiac output
  • Hormonal regulation:
    • Epinephrine (adrenaline) increases cardiac output
    • Norepinephrine increases cardiac output
    • Vasopressin (ADH) increases cardiac output

Long-Term Regulation of Cardiac Output

  • Renin-angiotensin-aldosterone system (RAAS) regulates blood pressure and volume over a longer period
  • RAAS activates to increase cardiac output and blood pressure
  • Atrial natriuretic peptide (ANP) is released by atria in response to increased blood volume
  • ANP decreases cardiac output and blood pressure by:
    • Reducing SNS activity
    • Promoting vasodilation

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