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What ions are important in the formation of membrane potentials?
Wiki User
∙ 15y ago
Potassium and sodium are involved in the action potential present in the neurone. When a stimuli is detected Sodium is pumped into the neurone causing depolarisation this flow of charges causing a voltage known as the action potential. When the stimuli is no longer detected sodium and potassium flow out to cause repolarisation.
Wiki User
∙ 12y ago
Wiki User
∙ 15y agoThe major ions are sodium and potassium. Chloride (inhibitory roles) and calcium (muscle action potentials) also play a role in certain systems.
Wiki User
∙ 15y agoMainly sodium and potassium. However chloride and calcium are also used in specialized circumstances.
Wiki User
∙ 14y agoSodium (Na+) and Potassium (K+)
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What two forces drive the passive transport of ions across a membrane?
Two forces drive the passive transport of ions across a membrane: -the concentration gradient of the ions -the effect of membrane potential (voltage) on the ions
What cell membrane do action potentials travel along?
The membrane or resting potential is the difference in voltage within and outside the cell when that cell is at rest. In a typical neuron it is usually around -65mV, meaning the neuron is negatively charged relative to the extracellular space. This potential is due to various ions and the permeability of the neuronal membrane. When a neuron gets a signal from another neuron, this causes the concentration of various ions to change (some flow in, others out of, the cell). In some cases, the signal causes positive ions to flow into the cell, making the membrane potential less negative. Once it reaches a threshold, usually around -55mV, the cell "fires" or makes an action potential, which is when the membrane potential temporarily shoots up to around +40mV. This signal propagates down the length of the neuron and then passes that message on to other cells.
In response to action potentials arriving from the transverse tubulesthe sarcoplasmic reticulum releases?
calcium ions.
The combining of the neurotransmitter with the muscle membrane receptors causes the membrane to become permeable to sodium ions and blank of the membrane?
Depolarization
What is the Difference between a receptor and an action potential?
action potential has a threshold stimulus and depolarization is just change in membrae potential where inside becomes for positive relative to outside. The AP has the ability to actually transmit info over long distance in axons once threshhold stimulus/depolarization is reached
Effects chlorine has on the generation and conduction of action potentials?
Influx of chloride ions into the neuron help to hyperpolarize the neuronal membrane, thus preventing the induction of an action potential. Therefore, chloride ions help to prevent generation of action potentials.
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.
How does the nervous system connect with ions?
Ions such as sodium and potassium drive the forces behind nerve impulses called action potentials. This happens via an ion gradient with selective ion channels that open and close depending on concentration in or out of the membrane of a neuron.
A neurotransmiter that allows sodium ions to leak into a postsynaptic neuron causes?
A neurotransmitter that allows sodium ions to leak into a postsynaptic neuron causes excitatory postsynaptic potentials. The neurotransmitter that is not synthesized in advance and packaged into synaptic vesicles is nitric oxide.
What two forces drive the passive transport of ions across a membrane?
Two forces drive the passive transport of ions across a membrane: -the concentration gradient of the ions -the effect of membrane potential (voltage) on the ions
What cell membrane do action potentials travel along?
The membrane or resting potential is the difference in voltage within and outside the cell when that cell is at rest. In a typical neuron it is usually around -65mV, meaning the neuron is negatively charged relative to the extracellular space. This potential is due to various ions and the permeability of the neuronal membrane. When a neuron gets a signal from another neuron, this causes the concentration of various ions to change (some flow in, others out of, the cell). In some cases, the signal causes positive ions to flow into the cell, making the membrane potential less negative. Once it reaches a threshold, usually around -55mV, the cell "fires" or makes an action potential, which is when the membrane potential temporarily shoots up to around +40mV. This signal propagates down the length of the neuron and then passes that message on to other cells.
What affect does lowering extracellular calcium have on the resting membrane potential of a neuron?
Low calcium levels in the extracellular fluid increase the permeability of neuronal membranes to sodium ions, causing a progressive depolarization, which increases the possibility of action potentials. These action potentials may be spontaneously generated, causing contraction of skeletal muscles (tetany).
What is the approximate resting potential of a neuron?
It is -70 millivolts. The resting potential of a neuron refers to the voltage difference across the plasma membrane of the cell, and is expressed as the voltage inside the membrane relative to the voltage outside the membrane. The typical resting potential voltage for a neuron is -70mV Resting potentials occur because of the difference in concentration of ions inside and outside of the cell, largely by K+ (Potassium ions) but some contribution is made by Na+(Sodium ions)
Which ions are permeable to phospholipids that make up the plasma membrane?
which ions are permeable to phospholipids that make up the plasma membrane
In response to action potentials arriving from the transverse tubulesthe sarcoplasmic reticulum releases?
calcium ions.
What movement do ion channels aid?
the movement of ions across a cell membrane.
What ions are positively charged and can cross back and forth across neuron and cell membrane?
There are two ions that can cross the cell membrane. The positively charged sodium and potassium ions can cross back and forth across the neuron cell membrane.
