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Copy of Venn Diagrams

Passive & active, diffusing & osmosis, & Endo & exo
by

Bridget Collier

on 10 October 2013

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Transcript of Copy of Venn Diagrams

Passive Transport
Active Transport
Types of passive transports
Diffusion
Osmosis
Facilitated diffusion
Diffusion through ion channels.
Passive transport is the transport of a substance across a cell membrane by diffusion; expenditure of energy is not required.
Passive transport occurs when a substance pass through the membrane.
Passive transport always occurs from a higher concentrated area, to a lower one.
No energy is required to make the substance move.
Active transport requires energy for the substance to move.
Active transport always happens from an area of lower concentration to a higher one.
The substance requires assistance from a protein to cross the membrane.
Both of these type of
transports involve a substance moving across a membrane
The substance goes from one concentration level to a different one.
Both these transports are important to the cell.
Diffusion
Osmosis
Diffusion is a type of passive transport.
Diffusion is the movement of any liquid or gas from an area of high concentration to an area of low concentration
Diffusion is necessary in order for the cell to create energy and other important nutrients.
Osmosis is the movement of water across a semipermeable membrane .
This happens from an area of low solute concentration to a solution with a high solute concentration, down a solute gradient.
Osmosis happens when the medium surrounding the cell has a higher water concentration than the cell. The cell then gains water and at the same time, many important molecules and particles. These help it grow, and move from one cell to another.
Both diffusion and osmosis are transfers of particles across a membrane
If more space is provided for substances to pass through, they pass faster.
If there is a short distance, the process is also sped up.
Endocytosis
Exocytosis
Exocytosis is a process in which a cell expels molecules and other objects that are too big to pass through the cell membrane.
During exocytosis, the chemicals inside the cell are surrounded by vesicles. The vesicles sometimes draw the molecules through the membrane.
Other times the molecules are swallowed up by the vesicle. Once inside the vesicle, the vesicle moves itself towards the cell membrane. When the vesicle is close enough, it forces the molecules through the membrane.
Exocytosis is useful for getting rid of waste from the body.
Although, exocytosis leads to the destruction of vesicles.
Endocytosis is carried out by eukaryotic cells to consume food particles. This is done by extending the plasma membrane until it surround the food particles.
Three different types of processes are used for endocytosis. These processes are phagocytosis, pinocytosis, and receptor-mediated endocytosis.
For phagocytosis the cell takes in a bacterium or food particle.
In pinocytosis, the cell takes in liquid material.
And last,receptor-mediated endocytosis happens when specific molecules such as LDL, pass through receptor mediated endocytosis.
Unlike exocytosis, endocytosis leads to the creation of vesicles.
It also helps to bring molecules inside the cell.
For both endocytosis and exocytosis vesicles are used for the transportation of molecules.
Also both of the processes require hydrolytic enzymes, which are in organelles such as lysosomes.
Tey are used to degrade the molecules into simpler substances.
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