The diagram shows sodium ions and potassium ions moving against their concentration gradients to cross the plasma membrane. which statement best describes how this movement is possible? question 4 options: the ions move across the semipermeable membrane through simple diffusion. atp provides the energy required to move the ions across the plasma membrane by active transport. water moves across the plasma membrane by osmosis and carries the ions with it.

The right answer is ATP provides the energy required to... by active transport.

The concentration of K + is typically 30 to 40 times higher inside the cells than outside, while the situation is reversed for Na + (see table). These differences are generated and maintained by an ATPase of the plasma membrane that behaves like a pump actively expelling 3 Na + ions to the outside of the cell and importing two K + ions inwards. Na + / K + ATPase thus decreases the intracellular concentration of positive ions. It is therefore electrogenic (and involved in the establishment of a membrane electric potential). The transport of Na + and K + is tightly coupled to the hydrolysis of ATP for the transfer of the two ions against their electrochemical gradient (primary active transport).

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

answer: b

coz red blood cells marrow and circulates the body for 120 days.