Changes in blood volume are detected by

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Stretch receptors in the atria are sensitive to changes in blood volume and pressure. When blood volume increases, the stretch receptors are activated and send signals to the hypothalamus and cardiovascular centers in the brainstem, which then regulate fluid balance and blood pressure. Osmoreceptors in the hypothalamus mainly detect changes in plasma osmolality. Cells in the proximal convoluted tubule are involved in the filtration and reabsorption of substances from the blood. Osmoreceptors in the medulla are involved in regulating water balance and thirst.

Changes in Blood Volume Are Detected by