What type of receptors (labeled B in the diagram)are used to sense increased blood osmotic pressure?

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Osmoreceptors are specialized sensory receptors that detect changes in osmotic pressure (concentration of solutes) in the blood. When the osmotic pressure increases, osmoreceptors stimulate the hypothalamus, which in turn stimulates thirst and the release of antidiuretic hormone (ADH) to increase water reabsorption in the kidneys.

What Type of Receptors (Labeled B in the Diagram)are Used