Anti-diuretic hormone (ADH)

• What is the role of ADH in water regulation?

  ADH controls water content in the blood
• How does ADH regulate water reabsorption?

  By regulating water reabsorption in the kidneys
• What factors can alter the concentration of blood plasma?

  Excess drinking, sweating, salty foods
• What happens when blood plasma concentration is high?

  ADH release increases, more water reabsorbed
• What is the result of increased ADH release?

  More concentrated urine is produced
• What happens when blood plasma concentration is low?

  ADH release decreases, less water reabsorbed
• What is the effect of decreased ADH release?

  More dilute urine is produced
• What type of control mechanism is used for ADH release?

  Negative feedback mechanism
• How does negative feedback maintain homeostasis for ADH?

  By regulating blood plasma concentration
• What are the effects of high blood plasma concentration on ADH and urine concentration?

  • Increased ADH release
  • More water reabsorbed by nephrons
  • More concentrated urine produced
• What are the effects of low blood plasma concentration on ADH and urine concentration?

  • Decreased ADH release
  • Less water reabsorbed by nephrons
  • More dilute urine produced
• What factors affect blood plasma concentration?

  • Excess drinking
  • Excessive sweating
  • Consumption of salty foods