Final answer:
Lung cells obtain sodium ions and chloride ions from adjacent blood vessels through secondary active transport, which involves the movement of sodium ions down a concentration gradient, pulling chloride ions into the cell. This helps maintain ion balance in the lung cells.
Step-by-step explanation:
Lung cells obtain sodium ions and chloride ions from the adjacent blood vessels through a process called secondary active transport. This process involves the movement of sodium ions down a concentration gradient, which creates an electrochemical gradient.
As a result, sodium ions are pulled into the cell along with chloride ions through specific transport proteins in the cell membrane. This helps maintain the balance of ions in lung cells.