7. Dehydration is a condition in which the quantity of water leaving the body is greater than the quantity entering the body. The diagram below outlines the stimulus-response model when a person suffers dehydration. Stimulus Neuron Response Receptors in hypothalamus Posterior pituitary gland Collecting ducts (kidneys) (i) Identify the stimulus that initiates the pathway shown in the diagram. Hormone

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A:

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