Active Transport Definition: Biology

❌ “It only moves large molecules.” ✅ Moves ions (Na⁺, K⁺, Ca²⁺), sugars, amino acids, and more.

A: The pumps stop working. Molecules will naturally diffuse until equilibrium is reached. In the case of the Sodium-Potassium pump, if it stops, cells will swell and potentially burst (lyse) due to osmotic imbalance. active transport definition biology

In the complex world of cellular biology, the movement of substances across membranes is a constant, highly regulated process. While some molecules drift freely via passive diffusion, others must be forced against the natural "tide." This process is known as . ❌ “It only moves large molecules

Active transport is generally categorized into two main types based on how energy is utilized: 1. Primary Active Transport In the case of the Sodium-Potassium pump, if

The cell membrane folds inward to "swallow" external materials (e.g., white blood cells consuming bacteria).

There are two sub-types of secondary transport:

A: No. Facilitated diffusion uses proteins to help molecules cross the membrane, but it moves molecules down the concentration gradient (high to low) and requires no energy . It is a form of passive transport.