Osmolarity and Tonicity Quiz

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Questions and Answers

Which solute contributes the most to the extracellular fluid (ECF) osmolality?

  • Potassium
  • BUN
  • Sodium (correct)
  • Glucose

Which solution is considered hypotonic?

  • Lactated Ringers
  • D5W (correct)
  • NS
  • Plasmalyte

Which hormone is released when serum osmolality increases and binds to V2 receptor to increase water retention?

  • Aldosterone
  • Renin
  • Angiotensin II
  • ADH (correct)

Which of the following is NOT considered an effective osmole?

<p>BUN (D)</p> Signup and view all the answers

Which solution is considered hypertonic?

<p>3% NaCl (B)</p> Signup and view all the answers

Which hormone is released when there is a decrease in effective circulating volume?

<p>Renin (D)</p> Signup and view all the answers

Which receptor does AVP bind to in the basolateral membrane?

<p>V2 receptor (B)</p> Signup and view all the answers

Where is aquaporin 2 located?

<p>Collecting duct (D)</p> Signup and view all the answers

What does angiotensin II stimulate in response to decreased blood volume?

<p>Non osmotic AVP release (D)</p> Signup and view all the answers

What does BP depend on?

<p>Cardiac output (CO) and venous return (VR) (D)</p> Signup and view all the answers

Which enzyme converts angiotensin I to angiotensin II?

<p>ACE (D)</p> Signup and view all the answers

What does angiotensin II cause in response to decreased blood volume?

<p>Increased sympathetic response (D)</p> Signup and view all the answers

What stimulates thirst in order to increase water intake and decrease kidney excretion?

<p>Angiotensin II (B)</p> Signup and view all the answers

Which of the following solutions is considered isotonic?

<p>NS (B)</p> Signup and view all the answers

Which hormone is released from the hypothalamus when sodium levels increase?

<p>AVP (D)</p> Signup and view all the answers

What is the primary determinant of intracellular fluid (ICF) osmolality?

<p>Potassium concentration (D)</p> Signup and view all the answers

Which of the following solutions is considered hypotonic?

<p>D5W (D)</p> Signup and view all the answers

Which hormone signals thirst in order to increase water intake and decrease kidney excretion?

<p>ADH (B)</p> Signup and view all the answers

What stimulates the release of renin in response to a decrease in effective circulating volume?

<p>Sympathetic response (C)</p> Signup and view all the answers

Which enzyme converts angiotensin I to angiotensin II?

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

Where is aquaporin 2 located?

<p>Distal nephron (B)</p> Signup and view all the answers

What does angiotensin II cause in response to decreased blood volume?

<p>Vasoconstriction (D)</p> Signup and view all the answers

Which of the following is NOT considered an effective osmole?

<p>BUN (D)</p> Signup and view all the answers

Which hormone is released in response to osmotic triggers and causes water retention by increasing aquaporin 2?

<p>ADH (D)</p> Signup and view all the answers

What is the goal of the renin-angiotensin-aldosterone system (RAAS)?

<p>To increase blood volume and increase pressure (B)</p> Signup and view all the answers

Which solution is used to increase intravascular fluid volume and blood pressure?

<p>Normal Saline (NS) (A)</p> Signup and view all the answers

Which condition is characterized by elevated lipids or proteins in the blood, resulting in a false decrease in sodium levels?

<p>Pseudohyponatremia (B)</p> Signup and view all the answers

Which condition is caused by hyperglycemia and is associated with an increase in serum osmolality?

<p>Hypertonic hyponatremia (D)</p> Signup and view all the answers

What is the first step in assessing hyponatremia?

<p>Assess serum osmolality (D)</p> Signup and view all the answers

Where is aquaporin 2 located?

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

What is the primary cause of hypertonic hyponatremia?

<p>Hyperglycemia (B)</p> Signup and view all the answers

What triggers the release of ADH in response to osmotic changes?

<p>Increased serum osmolality (A)</p> Signup and view all the answers

What is the function of angiotensin II in response to decreased blood volume?

<p>Increase sodium/water reabsorption (B)</p> Signup and view all the answers

Which hormone is released in response to osmotic triggers and causes water retention by increasing aquaporin 2?

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

Which condition is caused by hyperglycemia and is associated with an increase in serum osmolality?

<p>Hypertonic hyponatremia (D)</p> Signup and view all the answers

Which hormone signals thirst in order to increase water intake and decrease kidney excretion?

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

Which hormone is released when there is a decrease in effective circulating volume?

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

Which solution is used to increase intravascular fluid volume and blood pressure?

<p>Normal saline (NS) (A)</p> Signup and view all the answers

What is the first step in assessing hyponatremia?

<p>Assess serum osmolality (D)</p> Signup and view all the answers

Which hormone is released when sodium levels increase?

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

What is the goal of the renin-angiotensin-aldosterone system (RAAS)?

<p>To increase blood volume and increase pressure (C)</p> Signup and view all the answers

Where is aquaporin 2 located?

<p>Apical membrane (C)</p> Signup and view all the answers

Which solute contributes the most to the extracellular fluid (ECF) osmolality?

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

Which of the following is the primary goal of the renin-angiotensin-aldosterone system (RAAS)?

<p>To increase blood volume (D)</p> Signup and view all the answers

Which hormone is released in response to osmotic triggers and causes water retention by increasing aquaporin 2?

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

Which of the following solutions is considered isotonic?

<p>Normal saline (NS) (B)</p> Signup and view all the answers

What is the primary determinant of intracellular fluid (ICF) osmolality?

<p>Water levels (D)</p> Signup and view all the answers

What is the primary cause of hypertonic hyponatremia?

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

Which of the following is NOT considered an effective osmole?

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

Which condition is characterized by elevated lipids or proteins in the blood, resulting in a false decrease in sodium levels?

<p>Pseudohyponatremia (B)</p> Signup and view all the answers

Where is aquaporin 2 located?

<p>Renal collecting ducts (B)</p> Signup and view all the answers

What is the first step in assessing hyponatremia?

<p>Assess serum osmolality (B)</p> Signup and view all the answers

Which solute contributes the most to the extracellular fluid (ECF) osmolality?

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

Match the following conditions with their causes:

<p>Angiotensin 2 effect = Aldosterone increase, sodium/water reabsorption ADH release = Osmotic triggers, serum osmolality increase Non osmotic trigger of ADH = ECF volume decrease, RAAS activation Hypertonic hyponatremia = Hyperglycemia</p> Signup and view all the answers

Match the following substances with their effects:

<p>Dextrose = Converts to CO2 and H2O in the presence of O2 ADH = Increases water retention NS = Increases intravascular fluid to increase BP Lactated Ringers = Increases effective circulating volume</p> Signup and view all the answers

Match the following types of hyponatremia with their definitions:

<p>Isotonic hyponatremia = Pseudohyponatremia due to elevated lipids in the blood Hypertonic hyponatremia = Caused by hyperglycemia Hypotonic hyponatremia = Due to being hypovolemic, Euvolemic/SIADH or being hypervolemic</p> Signup and view all the answers

Match the following conditions with their causes or effects:

<p>Pseudohyponatremia = Caused by elevated lipids or proteins Hypertonic Hyponatremia = Associated with an increase in serum osmolality, tested by measuring glucose or lab testing of unmeasured mannitol, glycine, sorbitol</p> Signup and view all the answers

Match the following conditions with their goals or effects:

<p>Goal of RAAS = Increase blood volume (Na/Water retention) and increase pressure (vasoconstriction) Goal of ADH release = Dilute the blood by increasing aquaporin 2 to retain water Effect of dextrose = Increase intravascular fluid for increasing BP Effect of NS = Increase intravascular fluid to increase BP</p> Signup and view all the answers

Match the following conditions with their causes:

<p>Isotonic hyponatremia = Elevated lipids in the blood Hypertonic hyponatremia = Hyperglycemia Hypotonic hyponatremia = Being hypovolemic, Euvolemic/SIADH or being hypervolemic Pseudohyponatremia = Elevated lipids or proteins in the blood</p> Signup and view all the answers

Match the following substances with their effects:

<p>Dextrose = Converts to CO2 and H2O in the presence of O2 ADH = Increases water retention NS = Increases intravascular fluid to increase BP Lactated Ringers = Increases effective circulating volume</p> Signup and view all the answers

Match the following conditions with their causes:

<p>Angiotensin 2 effect = Aldosterone increase, sodium/water reabsorption ADH release = Osmotic triggers, serum osmolality increase Non osmotic trigger of ADH = ECF volume decrease, RAAS activation Hypertonic hyponatremia = Hyperglycemia</p> Signup and view all the answers

Match the following conditions with their definitions:

<p>Isotonic hyponatremia = Pseudohyponatremia due to elevated lipids in the blood Hypertonic hyponatremia = Caused by hyperglycemia Hypotonic hyponatremia = Due to being hypovolemic, Euvolemic/SIADH or being hypervolemic</p> Signup and view all the answers

Match the following conditions with their causes or effects:

<p>Pseudohyponatremia = Caused by elevated lipids or proteins Hypertonic Hyponatremia = Associated with an increase in serum osmolality, tested by measuring glucose or lab testing of unmeasured mannitol, glycine, sorbitol</p> Signup and view all the answers

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