Which means of particle transport is shown in Figure 7 4 below?
The correct answer is D. Active transport is the movement of a substance across a cell membrane against its concentration gradient (from low to high concentration instead of high to low, which is what naturally occurs as diffusion).
What is the end results of diffusion of particles in a cell?
Since diffusion moves materials from an area of higher concentration to the lower, it is described as moving solutes “down the concentration gradient.” The end result of diffusion is an equal concentration, or equilibrium, of molecules on both sides of the membrane. At equilibrium, movement of molecules does not stop.
What is a concentration gradient how does it apply to diffusion and osmosis?
A concentration gradient occurs when the concentration of particles is higher in one area than another. In passive transport, particles will diffuse down a concentration gradient, from areas of higher concentration to areas of lower concentration, until they are evenly spaced.
How does diffusion work in a cell?
Molecules can move into or out of cells by the process of diffusion . Diffusion is the net movement of molecules from an area where they are at a higher concentration to areas where they are at a lower concentration. Diffusion stops when the concentration of the substance is equal in both areas.
Where does osmosis and diffusion occur in the body?
Where Does It Happen? Osmosis occurs in both the small and large intestines, with the majority of osmosis occurring in the large intestine. As your body processes food, it moves from the esophagus to the stomach and then to the small intestine.
Does osmosis occur in the human body?
Osmosis is when water moves from an area of LOW solute concentration (low osmolarity) to an area of HIGH solute concentration (high osmolarity) through a semipermeable membrane. Osmosis plays an important role in the human body, especially in the gastro-intestinal system and the kidneys.
Why does diffusion occur in the body?
Diffusion is very important in the body for the movement of substances eg the movement of oxygen from the air into the blood and carbon dioxide out of the blood into the air in the lungs, or the movement of glucose from the blood to the cells. Cell membranes are partially permeable.