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
Example of secondary active transport- 
Select and explain. 
A. K+ transport, B. Water Transport, C. Transport of oxygen, D. Na+-amino acid transport
D: Na+-amino acid transport
Answer: D: Na+-amino acid transport 
Explanation: Ans. is 'd' i.e., Na+-amino acid transport Transport mechanismExamplesSimple diffusionMovement of fats, oxygen, CO2 through lipid portion of membraneFacilitated diffusionMovement of glucose and some amino-acidsOsmosisMovement of water into and out of the cellPrimary active transportIons K+, Na+, Ca++, H+Secondary active transportGlucose or amino-acid into the cell along Na+ (Symport or cotransport) Ca+2, H+ out of the cell against Na+ (Antiport or countertransport)