10 Questions
What effect does histamine have on AVP secretion?
Stimulates AVP secretion
How does a decrease in blood volume or pressure affect the set point of body fluid osmolality?
Shifts to lower osmolality values
What happens to water absorption from tubular fluid in response to AVP action on the kidneys?
Enhances absorption of water
What occurs in the kidneys when faced with circulatory collapse?
Continue to conserve water
Individuals with inadequate release of AVP are likely to experience:
Polyuria and polydipsia
What is a consequence of the kidneys conserving water in response to circulatory collapse?
Reduction in body fluid osmolality
How does AVP secretion respond to an increase in blood volume or pressure?
Increases AVP secretion
What is the condition called when body fluids become hyperosmotic due to deprivation of water?
Central diabetes insipidus
How do alterations in blood volume and pressure affect the response to changes in body fluid osmolality?
Shift set point to lower osmolality values and steeper slope relationship
What is a significant outcome of central diabetes insipidus (pituitary diabetes insipidus)?
Polyuria and polydipsia due to inadequate AVP release
Test your knowledge about the mechanisms of excreting a large volume of water or solute in the body. Learn about the synthesis of AVP and oxytocin by neurons in the supraoptic and paraventricular nuclei.
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