Question

(8 of 10) rbcs have an osmolarity of approximately 300 mosm. if a person is severely dehydrated, which of the following statements is true. blood plasma (water and solutes) osmolarity decreases during dehydration blood plasma volume increases during dehydration osmoreceptors in the posterior pituitary release adh that decreases water retention by the kidneys rbcs crenate due to the changes in blood osmolarity there is no change to the system due to homeostasis note: clicking any button other than the save answer button will not save any changes to your answers!

Explanation:

During dehydration, the body loses water. Blood plasma (which contains water and solutes) will have its osmolarity increase (not decrease) because there's less water relative to solutes. The posterior pituitary releases ADH (antidiuretic hormone) which increases water retention by the kidneys (not decreases), so that option is wrong. Blood plasma volume decreases during dehydration (not increases), so that option is wrong. RBCs (red blood cells) have an osmolarity around 300 mOsm. When a person is dehydrated, blood osmolarity increases, so water will leave the RBCs, causing them to crenate (shrivel). The "no change" option is wrong because homeostasis tries to adjust, but dehydration causes changes. So the correct statement is that RBCs crenate due to changes in blood osmolarity.

Answer:

RBCs crenate due to the changes in blood osmolarity