Chapter 3 - Cells Exchange Materials Flashcards
How does a cell achieve Homeostasis?
The cells are maintained at a constant temperature and the concentration of fluids around the cell is kept constant.
Define Homeostasis.
The maintenance of a relatively constant internal environment despite fluctuations in the external environment.
Respiration Formula:
Oxygen + Glucose = Carbon Dioxide + Water + Waste
O2 + C6H12O6 = CO2 + H2O
What is the Cell Membrane composed mainly of?
Lipids and Proteins
What’s the difference between a Passive process and an Active process?
A passive process occurs without the use of the cell’s energy which comes from respiration and an Active process requires the use of the cell’s energy.
What is Diffusion?
- Passive Process
* Resulting from the random movement of ions and molecules.
What is Vesicular a Transport ?
- Active Process
* Where materials are moved in membrane-bound sacs.
What is Carrier-mediated Transport?
- May be Passive or Active
* Requires special proteins in the cell membrane to bind to an ion or molecule and help it move across the membrane.
How does diffusion work?
The greater the difference in concentration the “steeper” the diffusion gradient and the faster the diffusion will occur.
How does Osmosis work?
Osmosis is a special type of diffusion, it is the diffusion of a solvent through a semi-permeable membrane.
What is Facilitated Diffusion?
It is a process carried out through the cell membrane by carrier proteins when a substance is too big to be transported through the cell membrane through simple diffusion.
What is Active Transport?
Active transport is the movement of substances across the membrane against the concentration gradient using cellular energy.
Define Vesicular Transport.
An active transport which materials move into or out of the cell enclosed as vesicles.
Define Osmotic Pressure.
The pressure that would have to be applied to a pure solvent to prevent it from passing into a given solution by osmosis, often used to express the concentration of the solution.
