Lưu ý: Bản dịch của mục này hiện đang được kiểm tra chất lượng, vì vậy một số nội dung tạm thời chỉ hiển thị bằng tiếng Anh.
Mục từ này chưa được dịch sang ngôn ngữ của bạn, vì vậy nội dung gốc được hiển thị bên dưới.
concentration gradient
This term is a technical expression used primarily in chemistry, biology, and physics to describe the driving force behind passive transport. It describes a spatial variation in the density of a solute, creating a chemical potential that naturally pushes particles toward an area of lower density to achieve equilibrium.
In a biological context, this concept is central to understanding osmosis and diffusion. It is typically used in formal scientific discourse to explain how nutrients enter cells or how waste products leave them without the expenditure of cellular energy.
Ý nghĩa
The difference in the concentration of a substance between two regions, which drives the net movement of molecules from the area of higher concentration to the area of lower concentration.
Molecules move down the concentration gradient to reach equilibrium.
Ví dụ
Molecules naturally move down the concentration gradient from high to low density.
The cell uses energy to pump ions against the concentration gradient.
Oxygen diffuses across the alveolar membrane following a steep concentration gradient.
Wait, so the solute just flows down the concentration gradient until it reaches equilibrium?
A strong concentration gradient accelerates the rate of diffusion.
I wonder if the drug can penetrate the blood-brain barrier by utilizing a concentration gradient.
The movement of water occurs along an osmotic concentration gradient.
Passive transport requires no ATP because it relies on the existing concentration gradient.