Chapter 3.4 bio
Hypotonic
This type of solution is one in which there are less dissolved particles outside the cell than inside the cell. Water will flow into the cell in order to maintain homeostasis.
Exocytosis
the release of substances out of a cell by the fusion of a vesicle with the membrane
Describe carrier proteins. What do they look like? How do they help move materials across the membrane?
Carrier proteins change their shape to help move materials.
Describe channel proteins. What do they look like? How do they help move materials across the membrane?
Channel proteins have an opening or gate which molecules can passively move by facilitated diffusion
Active transport
Drives molecules across a membrane from a region of lower concentration to a region of lower concentration, it requires energy.
How does facilitated diffusion differ from simple diffusion?
Facilitated diffusion crosses a membrane with the aid of passive transport proteins in the membrane.
The word "facilitate" means " to make easier". How does this meaning apply to facilitated diffusion?
It applies by facilitated diffusion makes the molecules move easier and faster.
Facilitated diffusion is a type of _____________ transport because it does not require energy.
Passive
Concentration Gradient
The difference in the concentration of a substance from one location to another
Facilitated Diffusion
The diffusion of large particles through a membrane with the help of protein channels from a higher concentration to a lower concentration.
Osmosis
The diffusion of water through a membrane from higher water concentration to a lower water concentration.
Active Transport
The movement of particles across a membrane from a lower concentration to a higher concentration, which requires energy.
Diffusion
The movement of particles from a region of higher concentration to a region of lower concentration.
Hypertonic
This type of solution is one in which there are more dissolved particles outside the cell than inside the cell. Water will flow out of the cell in order to maintain homeostasis.
Phagocytosis
a type of endocytosis in which the cell membrace engulfs large particles
Endocytosis
the process of taking liquids or fairly large molecules into a cell by engulfing them in a membrane.
in facilitated diffusion, do molecules move down a concentration gradient, or against a concentration gradient?
they move against a concentration gradient
Isotonic
this type of solution is one in which there are an equal number of dissolved particles inside and outside the cell. Water will flow equally in both directions in the above illustration in order to maintain homeostasis.
