Use the information in Table 1.1 to identify and describe the mechanism by which potassium ions enter red blood cells from the blood plasma.
Sodium ions and oxygen molecules both enter red blood cells. State one similarity and one difference between the mechanisms used by sodium ions and oxygen molecules to enter red blood cells.
Chloride ions pass across the membrane of human red blood cells in a process known as the chloride shift. Explain why the chloride shift is important for the transport of carbon dioxide from respiring tissues.
Scientists investigated the uptake of a substance, $F$, by human red blood cells. The red blood cells were placed in a solution containing substance $F$ for $30$ minutes. After this period, the scientists observed that the cell surface membrane of the red blood cells had infoldings (invaginations) and that the number of vesicles in the cytoplasm had increased. Identify the process by which substance $F$ entered the red blood cells.