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Which statement correctly describes what causes the second voltage-gated Na plus channel to open?
The second voltage-gated Na+ channel opens due to the membrane potential of the neuron becoming further depolarized beyond its threshold level. This depolarization causes a change in the conformation of the channel's protein subunits, allowing the flow of Na+ ions into the neuron.
A molecule that is released from synaptic vesicles and serves as the means of communication from one neuron to the next or from one neuron to an effector cell?
a neurotransmitter such as acetylcholine, or dopamine. Even a neuropeptide.They will cause a receptor gated channel to open post synaptically
What is a gated channel?
A gated channel is a protein channel in a cell membrane that can open or close to allow specific ions, like sodium or potassium, to pass through. The opening and closing of these channels are controlled by certain signals, like changes in voltage or the binding of specific molecules, in order to regulate the flow of ions into and out of the cell.
What would happen if a chemically gated sodium channel in the postsynaptic membrane were completely blocked?
Blocking the chemically gated sodium channel in the postsynaptic membrane would prevent sodium ions from entering the neuron, hindering depolarization and transmission of the signal. This would effectively inhibit the neuron from responding to neurotransmitters released by the presynaptic neuron, leading to a disruption in neuronal communication and a potential loss of function in the neural circuit.
Function membrane receptor at chemical synapse?
Membrane receptors at a synapse are ligand-gated ion channels that open and allow sodium ions to flow into the neuron upon binding of the neurotransmitter ligand to generate an action potential in the neuron.
What type of ion channels does an actions potential in the axon terminal of a motor neuron open?
Voltage-gated calcium channels are the ion channels that open during an action potential in the axon terminal of a motor neuron. These channels allow calcium ions to flow into the terminal, triggering the release of neurotransmitters into the synaptic cleft.
What does a gated channel in a cell membrane allow?
A gated channel in a cell membrane allows for the selective passage of specific ions or molecules into or out of the cell. This regulation is important for maintaining proper cell function and controlling the cellular environment. Gated channels can open or close in response to various stimuli, such as voltage changes or chemical signals.
Is a sodium channel that is opened by acetylcholine considered to be voltage-gated?
Yes, a sodium channel that is opened by acetylcholine is not considered to be voltage-gated.
What is a stimulus gated channel?
There are voltage-gated ion channels and ligand-gated ion channels, and since both are stimuli the term stimulus-gated is a redundancy.
What areas of the neuron generate signals that open these voltage gated channels?
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What is The region of a neuron with voltage-gated sodium channels?
The region of a neuron with voltage-gated sodium channels is the axon hillock. This is where action potentials are initiated in response to incoming signals. Sodium channels open in response to depolarization, allowing sodium ions to flow into the neuron and trigger an action potential.
How does an impulse travel from a presynaptic neuron to a postsynaptic neuron?
When the action potential reaches the button(axon terminal) of the presynaptic neuron the depolarization causes voltage gated calcium channels to open increasing intracellular calcium content. This causes synaptic vesicles to fuse to the membrane and release neurotransmitters that bind to the post synaptic neuron and create a chemical action potential.
