SSCE VCE Biology Regulation of Plant and Animal Systems: Antidiuretic hormone (ADH) is a

Question

Antidiuretic hormone (ADH) is a hormone involved in the regulation of blood plasma solute concentration. Osmoreceptors detect changes in blood plasma solute concentration and stimulate magnocellular neurons. Magnocellular neurons are special neurons that synthesize ADH, storing ADH in vesicles until stimulated to release it. ADH diffuses across a gap and into a capillary. This process is shown in the diagram below.

The graph below shows the concentration of ADH in the blood at different plasma solute concentrations.

Based on the information given and your own knowledge, which of the following is a correct statement?
A. At plasma solute concentrations below 285 mOsm/kg, nerve electrical impulses from the osmoreceptor are too small in magnitude to trigger the release of neurotransmitter.

B. At plasma solute concentrations above 285 mOsm/kg, nerve electrical impulses begin to cross the synaptic gap between the osmoreceptor and the magnocellular neuron.

C. At plasma solute concentrations above 285 mOsm/kg, the frequency of nerve electrical impulses in the magnocellular neuron will trigger increased release of ADH.

D. At plasma solute concentrations between 270 and 285 mOsm/kg, the osmoreceptors do not detect changes.

Antidiuretic hormone (ADH) is a hormone involved in the regulation of blood plasma solute concentration - VCE - SSCE Biology - Question 14 - 2016 - Paper 1

Worked Solution & Example Answer:Antidiuretic hormone (ADH) is a hormone involved in the regulation of blood plasma solute concentration - VCE - SSCE Biology - Question 14 - 2016 - Paper 1

C. At plasma solute concentrations above 285 mOsm/kg, the frequency of nerve electrical impulses in the magnocellular neuron will trigger increased release of ADH.

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