6.4.3 Control of Blood Water Potential

• Blood water potential is crucial for maintaining cellular function.function
• Overhydration occurs when there is a low solute concentration in the blood.blood
• Higher solute levels in the blood decrease the blood water potential.potential
• Osmoreceptors trigger physiological responses to maintain water balance.balance
• Match the aspect with its function:

  Hypothalamus ↔️ Regulates water balance

  Thirst Center ↔️ Stimulates water intake

  Pituitary Gland ↔️ Releases ADH
• A balanced blood water potential prevents both dehydration and overhydration
• Order the steps in maintaining blood water balance:

  1️⃣ Water moves into cells

  2️⃣ Equilibrium is achieved

  3️⃣ Nutrient delivery occurs

  4️⃣ Waste removal is facilitated
• Where are osmoreceptors located in the body?

  Hypothalamus
• The hypothalamus maintains water balance by detecting changes in blood water potential.


  True
• Match the aspect with its function or mechanism:

  Hypothalamus ↔️ Regulates water balance

  Thirst Center ↔️ Stimulates thirst

  Pituitary Gland ↔️ Releases ADH
• ADH is transported through the bloodstream to the kidneys.
• ADH increases the permeability of collecting ducts to water.


  True
• Increased temperature decreases blood water potential.


  True
• Match the term with its description:

  Osmoreceptors ↔️ Specialized cells in the hypothalamus

  Hypothalamus ↔️ Brain region housing osmoreceptors

  Antidiuretic Hormone ↔️ Released by the pituitary gland

  Homeostasis ↔️ Maintaining fluid balance
• ADH promotes water reabsorption in the kidneys.

  True
• What happens when blood becomes too concentrated according to the hypothalamus?

  Thirst stimulation and ADH release
• Osmoreceptors detect high solute concentrations in the blood, indicating low water potential.
• ADH increases the water permeability of collecting ducts.


  True
• ADH helps maintain blood water potential during dehydration.

  True
• If the blood becomes too concentrated, it signals dehydration.
• A balanced blood water potential prevents dehydration or swelling of cells.


  True
• Increased temperature decreases blood water potential.


  True
• Higher blood pressure increases blood water potential.

  True
• What does the hypothalamus stimulate when blood water potential is low?

  Thirst center
• ADH promotes water reabsorption in the kidneys.kidneys
• Blood water potential ensures cells receive adequate water for function.


  True
• What effect do higher solute levels have on blood water potential?

  Decrease water potential
• Higher pressure in blood increases water potential.

  True
• Osmoreceptors trigger the release of ADH from the pituitary gland.
• Order the steps in the hypothalamus' response to dehydration:

  1️⃣ Osmoreceptors detect low water potential

  2️⃣ Thirst center is stimulated

  3️⃣ Pituitary gland releases ADH

  4️⃣ Water reabsorption increases
• Osmoreceptors in the hypothalamus detect low water potential.

  True
• Order the steps in ADH's effect on the collecting ducts:

  1️⃣ ADH binds to receptors

  2️⃣ Aquaporins are inserted

  3️⃣ Water permeability increases

  4️⃣ Water is reabsorbed
• What are the main components that affect blood water potential?

  Solutes, temperature, pressure, osmosis
• How does higher blood pressure affect blood water potential?

  Increases water potential
• Where are osmoreceptors located?

  Hypothalamus
• What is the role of osmoreceptors in the body?

  Maintain fluid homeostasis
• If blood is too dilute, ADH release is inhibited.

  True
• ADH binds to receptors on collecting duct cells, stimulating the insertion of aquaporins into the cell membranes.
• Steps in the response of the kidneys to ADH:

  1️⃣ ADH binds to collecting duct cell receptors

  2️⃣ Aquaporins are inserted into cell membranes

  3️⃣ Water moves from collecting ducts into bloodstream

  4️⃣ Urine volume decreases, becomes concentrated
• Which hormone is released by the pituitary gland in response to low blood water potential?

  Antidiuretic Hormone (ADH)