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Mindmap von Sean JENSEN, aktualisiert more than 1 year ago
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Erstellt von Sean JENSEN
vor etwa 9 Jahre
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Methods of transport
By: Sean Jensen - 12M
- Diffusion
- Facillitated diffusion
- Facilitated diffusion in many respects is similar to
diffusion, it operates on the same principles of the net
movement of particles from region of higher potential
to a region of lower potential, it is also a passive process.
- However, facilitated diffusion requires the
presence of an intrinsic carrier protein
- Each protein has a specific substance that it transports
- The protein can be a channel protein or a carrier protein
- Channel proteins tend to be selective, water filled pores allow for
the transport of certain ions. Channel proteins can be gated, only
opening in specific conditions
- Carrier proteins can change shape when a
particle binds to the protein, this allows the
particle to move through
- Channel proteins tend to be selective, water filled pores allow for
the transport of certain ions. Channel proteins can be gated, only
opening in specific conditions
- The protein can be a channel protein or a carrier protein
- Each protein has a specific substance that it transports
- However, facilitated diffusion requires the
presence of an intrinsic carrier protein
- Facilitated diffusion in many respects is similar to
diffusion, it operates on the same principles of the net
movement of particles from region of higher potential
to a region of lower potential, it is also a passive process.
- Diffusion is the net movement of particles
from a region of higher potential to a region
of lower potential, down the concentration gradient
- This is a passive process, meaning it doesn't require an
external form of energy, it only requires the energy derived
from kinetic energy
- Factors that affect the rate of diffusion
- Temperature
- Increased temperature increases the rate of reaction, this is because an
increase in temperature leads to an increase in kinetic energy, this increases
the randomness of the particles inside the substance and prompt them to be
more likely to move
- Increased temperature increases the rate of reaction, this is because an
increase in temperature leads to an increase in kinetic energy, this increases
the randomness of the particles inside the substance and prompt them to be
more likely to move
- Surface area
- A large surface area to volume ratio will increase rate of diffusion. This
is because as the surface area to volume ratio increases, there is more
area for the particles to interact and a lower volume ratio decreases the
net diffusion distance
- A large surface area to volume ratio will increase rate of diffusion. This
is because as the surface area to volume ratio increases, there is more
area for the particles to interact and a lower volume ratio decreases the
net diffusion distance
- Diffusion distance
- The greater the distance, the lesser the rate of
reaction, this is because it takes more time to reach
the centre of the object, requiring more time to
diffuse
- The greater the distance, the lesser the rate of
reaction, this is because it takes more time to reach
the centre of the object, requiring more time to
diffuse
- Difference in concentration
- A greater difference in concentration means a faster
rate of diffusion, this is because the particles will be
more likely to want to stabilise particle weighting
- A greater difference in concentration means a faster
rate of diffusion, this is because the particles will be
more likely to want to stabilise particle weighting
- Nature of the molecule
- Larger molecules will diffuse slower due to the
size they occupy, non-polar molecules also tend
to diffuse faster with the exception of water due
to its size
- Larger molecules will diffuse slower due to the
size they occupy, non-polar molecules also tend
to diffuse faster with the exception of water due
to its size
- Temperature
- This is a passive process, meaning it doesn't require an
external form of energy, it only requires the energy derived
from kinetic energy
- Facillitated diffusion
- Active transport
- Active transport, as the name suggests is a process that's active, meaning it requires external
energy in the form of Adenosine Triphosphate (ATP), Active transport is described as the net
movement of particles from a region of lower potential to a region of higher potential, against the
concentration gradient. This process, like facilitated diffusion requires the presence of an intrinsic
protein
- Active transport, as the name suggests is a process that's active, meaning it requires external
energy in the form of Adenosine Triphosphate (ATP), Active transport is described as the net
movement of particles from a region of lower potential to a region of higher potential, against the
concentration gradient. This process, like facilitated diffusion requires the presence of an intrinsic
protein
- Bulk transport
- Bulk transport involves the movement of a large
amount of particles in and out of cells, endocytosis and
exocytosis respectively
- Endocytosis involves the engulfing of substances by
the cell surface membrane to form sacs/endocytotic
vacuoles
- Endocytosis is classified in two forms,
Pinocytosis and Phagocytosis
- Pinocytosis is the uptake of liquids, and
Phagocytosis is the uptake of solids
- Pinocytosis is the uptake of liquids, and
Phagocytosis is the uptake of solids
- Exocytosis involves the secretion of
materials by the cell surface membrane
- Endocytosis is classified in two forms,
Pinocytosis and Phagocytosis
- Endocytosis involves the engulfing of substances by
the cell surface membrane to form sacs/endocytotic
vacuoles
- Bulk transport involves the movement of a large
amount of particles in and out of cells, endocytosis and
exocytosis respectively
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