peroxisome
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They are small vesicles found around the cell. They have a
single membrane that contains digestive enzymes for
breaking down toxic materials in the cell. They differ from
lysosomes in the type of enzyme they hold. Peroxisomes
hold on to enzymes that require oxygen (oxidative
enzymes). Lysosomes have enzymes that work in oxygen-
poor areas and lower pH.
, Peroxisomes absorb nutrients that the cell has acquired.
They are very well known for digesting fatty acids. They also
play a part in the way organisms digest alcohol (ethanol).
Because they do that job, you would expect liver cells to
have more peroxisomes than most other cells in a human
body. They also play a role in cholesterol synthesis and the
digestion of amino acids.
Neurotransmission step #1
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Action potential travel down the axon and reaches the terminal button.
The pump
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The sodium potassium pump expels sodium ions (Na+) and
draws in potassium ions (K+). 3 sodium out~> 2 sodium in <~
The sodium channels open during action potential and
allow sodium ions to flood into the axon.
Excitatory post -synaptic potential or ESPS
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, Positive ions are admitted to the cell body causing the cell to become
POSITIVE, allowing the cell to be closer to threshold.
What is step 2 of an Action Potential?
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Threshold is reached.
If the threshold of excitation is reached, all Na+ channels
open and the membrane depolarizes.
Gap junctions (cell junctions)
*A gap junction is a specialized cell junction that directly connects the cytoplasm of
two cells.
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-Gap junctions allow various molecules and ions to pass
freely between cells.
-A gap junction channel is composed of two connexons,
also known as hemichannels, which line up across the
intercellular space.
-Most gap junction hemichannels are composed of a
complex of six connexin proteins, each characterized by
four transmembrane domains. Six connexin sub-units
assemble to create one connexon, or hemichannel.
Channel composition influences the function of the gap
junction.
-Gap junctions allow for electrical communication between
cells, they also allow they passage of small second
Give this one a try later!
They are small vesicles found around the cell. They have a
single membrane that contains digestive enzymes for
breaking down toxic materials in the cell. They differ from
lysosomes in the type of enzyme they hold. Peroxisomes
hold on to enzymes that require oxygen (oxidative
enzymes). Lysosomes have enzymes that work in oxygen-
poor areas and lower pH.
, Peroxisomes absorb nutrients that the cell has acquired.
They are very well known for digesting fatty acids. They also
play a part in the way organisms digest alcohol (ethanol).
Because they do that job, you would expect liver cells to
have more peroxisomes than most other cells in a human
body. They also play a role in cholesterol synthesis and the
digestion of amino acids.
Neurotransmission step #1
Give this one a try later!
Action potential travel down the axon and reaches the terminal button.
The pump
Give this one a try later!
The sodium potassium pump expels sodium ions (Na+) and
draws in potassium ions (K+). 3 sodium out~> 2 sodium in <~
The sodium channels open during action potential and
allow sodium ions to flood into the axon.
Excitatory post -synaptic potential or ESPS
Give this one a try later!
, Positive ions are admitted to the cell body causing the cell to become
POSITIVE, allowing the cell to be closer to threshold.
What is step 2 of an Action Potential?
Give this one a try later!
Threshold is reached.
If the threshold of excitation is reached, all Na+ channels
open and the membrane depolarizes.
Gap junctions (cell junctions)
*A gap junction is a specialized cell junction that directly connects the cytoplasm of
two cells.
Give this one a try later!
-Gap junctions allow various molecules and ions to pass
freely between cells.
-A gap junction channel is composed of two connexons,
also known as hemichannels, which line up across the
intercellular space.
-Most gap junction hemichannels are composed of a
complex of six connexin proteins, each characterized by
four transmembrane domains. Six connexin sub-units
assemble to create one connexon, or hemichannel.
Channel composition influences the function of the gap
junction.
-Gap junctions allow for electrical communication between
cells, they also allow they passage of small second
