Final answer:
The scenario described involves counter transport, or antiport, as it moves Na+ into the cell while transporting Ca++ out of the cell in opposite directions. This is a form of active transport, which requires energy to move ions against their electrochemical gradient.
Step-by-step explanation:
The process you described, where a transport protein couples the inward flow of Na⁺ with the outward flow of Ca⁺⁺, is a type of membrane transport known as counter transport, also referred to as antiport. This mechanism involves moving two or more substances in opposite directions across the cell membrane. In contrast, cotransport, also known as symport, occurs when substances are moved in the same direction at the same time.
The maintenance of sodium and potassium ion concentrations is achieved through a process known as active transport. Active transport requires energy, usually in the form of ATP, because it involves moving ions against their concentration gradient, which is a thermodynamically unfavorable direction.