This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Transport Across Cell Membrane, Subject name: Physiology
Na + uptake at basolateral surface of apical cells is by - 
Select and explain. 
A. Active transport, B. Passivetransport, C. Diffusion, D. Osmosis
A: Active transport
Answer: A: Active transport 
Explanation: Ans. is 'a' i.e., Active transporto The Na+ - 1C pump operates at basolateral membrane which maintains intracellular concentration of Na+ very low.o Na+ - K+ pump is a pump for active transport.