Question

in addition to their other functions, red blood cells (rbcs) have the capacity to carry water. the surface of the cell contains structures called aquaporins, which transport water across cell membranes. rbcs are able to expand up to 74% or shrink up to 40% compared to the original cell size. due to their unique cell structure, maintains homeostasis? 3. which statement provides the best explanation for how red blood cells contribute to a feedback mechanism that help the kidneys more efficiently regulate salt and water balance. (1) the aquaporins in the red blood cells facilitate the exchange of water in environments of different concentrations and help the kidneys more efficiently regulate salt and water balance. (2) the aquaporins in the red blood cells prevent the exchange of water in environments of different concentrations and help the kidneys more efficiently regulate salt and water balance. (3) the red blood cells change their shape to move through the kidney but have minimal effect on salt and water balance in the kidneys. (4) the red blood cells change their shape to move through the kidney but do not regulate any feedback mechanisms.

Explanation:

Los glóbulos rojos (RBCs) no regulan el equilibrio de sal y agua del organismo (esa función corresponde a los riñones). Los acuaporín en los RBCs facilitan el intercambio de agua para que las células se expandan o encogieran según la concentración del medio, lo que les permite moverse por vasos estrechos, pero sin afectar la regulación del equilibrio salino-agua del organismo. Las opciones (1) y (2) son incorrectas porque los RBCs no ayudan a los riñones a regular el equilibrio, y la (3) es errónea al afirmar que tienen efecto en ese equilibrio.

Answer:

(4) The red blood cells change their shape to move through the kidney but do not regulate any feedback mechanisms.