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Which ions are permeable to phospholipids that make up the plasma membrane?
which ions are permeable to phospholipids that make up the plasma membrane
Through the membrane of a resting neuron highly permeable to potassium ions its membrane potential does not exactly match the equilibrium potential for potassium because the neuronal membrane is?
Slightly permeable to sodium ions.
What type of molecules can permeate the plasma membrane?
Any molecule smaller than the holes in the membrane can pass through is the membrane is permeable. If the membrane is semi-permeable, then only molecules that the membrane selects can pass through. Electronegativity and existence of lipid layers are common selective traits for semi-permeable membranes.
What is the main reason Na and K ions CANNOT easily diffuse through plasma membranes?
they are hydrophilic and can't cross the hydrophobic region of the plasma membrane
The plasma cell membrane regulates which molecules can or cannot enter a cell since it is?
permeable (has channels/transporters for specific ions/molecules)
Which ions are permeable to phospholipids that make up the plasma membrane?
which ions are permeable to phospholipids that make up the plasma membrane
Through the membrane of a resting neuron highly permeable to potassium ions its membrane potential does not exactly match the equilibrium potential for potassium because the neuronal membrane is?
Slightly permeable to sodium ions.
2 examples of partially permeable membranes?
A selectively permeable membrane is most often attributed to the cell membrane (plasma membrane) of cells. It is constructed of nonpolar phospholipids that will not dissolve many substances, like ions or large molecules. There are carrier proteins embedded in the membrane that allow only certain substances through.
How plasma membrane diffuse across plasma membrane?
Ions can't diffuse across membranes, they must used channels to transport across
What type of molecules can permeate the plasma membrane?
Any molecule smaller than the holes in the membrane can pass through is the membrane is permeable. If the membrane is semi-permeable, then only molecules that the membrane selects can pass through. Electronegativity and existence of lipid layers are common selective traits for semi-permeable membranes.
The movement of positively charged ions across the membrane of a neuron can produce what?
The movement of positively charged ions across the membrane of a neuron can produce action potential. Electrical potentials are commonly generated across the membranes of neurons as well.
What is the main reason Na and K ions CANNOT easily diffuse through plasma membranes?
they are hydrophilic and can't cross the hydrophobic region of the plasma membrane
The plasma cell membrane regulates which molecules can or cannot enter a cell since it is?
permeable (has channels/transporters for specific ions/molecules)
How does electricity affect the functioning of a neuron?
Electricity excites neurons. This happens because neuronal membranes are population with special type of protein called 'voltage-sensitive ion channels'. These become more permeable to specific ions with electrical current and as a result the cell will become metabolically more active.
When calcium ions enter the synaptic terminal?
they cause vesicles containing neurotransmitter molecules to fuse to the plasma membrane of the sending neuron.
What two factors maintain the unequal distribution of ions while the neuron is at rest?
strangely worded question i guess it is someone's homework. I suppose Factor 1: The neuron membranes have proteins which actively pump ions to create a potential (The Sodium/Potassium Pump) and Factor 2: charged ions slowly leak out through the cell membrane.
What is selectively permeable materials?
Selective permeable materials refer to substances that allow certain molecules or ions to pass through while preventing others from doing so. This property is due to their structure and composition, which includes channels, pores, or specific binding sites that only accommodate certain molecules or ions based on size, charge, or other characteristics. Examples of selectively permeable materials include cell membranes, which regulate the passage of molecules in and out of cells, and semi-permeable membranes used in filtration processes.
