In a symport:

Key Points

• In a symport, both molecules cross the membrane in the same direction.
• Symport is a type of cotransport mechanism where two molecules or ions are transported across a biological membrane simultaneously.
• It is an essential process in various biological functions, including nutrient absorption and ion balance in cells.
• For example, the Na+/glucose symporter in the intestinal cells allows the absorption of glucose alongside sodium ions.

Additional Information

• Symport is one of the two main types of cotransport, the other being antiport, where two molecules move in opposite directions.
• The energy for symport can be derived from various sources, including ATP hydrolysis or the electrochemical gradient of another ion.
• Symporters are integral membrane proteins and play a crucial role in maintaining cellular homeostasis.
• Disruptions in symport mechanisms can lead to various diseases and metabolic disorders.