23 Questions
What is the result of K+ ions diffusing out of the cell?
The inside of the cell becomes relatively negative
What is the consequence of Na+ ions diffusing into the cell?
The inside of the cell becomes relatively positive
In nerve diffusion potentials, what is the role of K+ ions?
Diffuses out of the cell, leaving the inside negative
How does the direction of diffusion potential depend on the relative concentrations of ions inside vs outside the cell?
It determines whether the inside becomes relatively positive or negative
Potassium diffusion potential is established when K+ ions diffuse into the cell, leaving it relatively negative inside.
False
Sodium diffusion potential is established when only Na+ ions can diffuse out of the cell, leaving it relatively positive inside.
True
The direction of the diffusion potential depends only on the concentration of the ion involved inside vs outside the cell.
False
In nerve diffusion potentials, K+ ions have a higher concentration outside cells and diffuse in, leaving the inside positive.
False
What is the primary function of the plasma membrane?
Regulates the passage of substances in and out of the cell
What is the gel-like substance in the cytoplasm called?
Cytosol
Which organelle is responsible for protein modification and sorting within the cell?
Golgi apparatus
What is the main constituent of the plasma membrane?
Lipids and proteins
Where is the genetic material found within a typical cell?
Nucleus
Which component of the cell fills the space between the nucleus and the cell membrane?
Cytosol
What is the primary function of the nucleolus?
Producing ribosomes
Which organelle is often referred to as the powerhouse of the cell?
Mitochondria
What is the main function of the endoplasmic reticulum (ER)?
Synthesizing proteins and lipids
Which statement best describes the function of the Golgi apparatus?
Packaging and distributing molecules
What is the role of the cell membrane in regulating the passage of substances?
Facilitating active transport
Which organelle is responsible for producing ribosomes?
Nucleolus
What is the function of the fluid mosaic model in the cell membrane?
Adapting to environmental changes
Which organelle plays a role in lipid metabolism and detoxification?
Smooth endoplasmic reticulum (ER)
What is the crucial function of the cell membrane?
Regulating the passage of substances
Learn about the establishment of diffusion potentials across selectively permeable membranes when ions diffuse down their concentration gradients. Explore potassium and sodium diffusion potentials and how they are established based on the ions involved.
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