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Depends on the ion channel. Heart muscle cells have both leaky channels that are open all the time and other channels that only open at certain voltages across the cell membrane.
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∙ 12y ago
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What is it that ion channels may be always or have?
They may be always open or they may have close gated channels
Ion channel that are always open are called?
leak channes
Are ion channels cell membrane pores?
Sort of, but some are gated.
Which ion channels open in response to a change in membrane potential?
voltage-gated ion channels
When the nervous system signals a muscle to contract the ion channels open?
sodium ion
When the nervous system signals a muscle to contract what ion channels open?
sodium ion
When the alpha subunit of the G protein is activated it can stimulate ion channels to?
open and close channels
What is the open or close in response to binding specific molecules?
Chemically-gated channels
What channels open when the nervous system signals a muscle to contract?
sodium ion
When an action potential arrives at the axon terminal of motor neuron which ion channels open?
voltage-gated calcium channels
Are gated channels are always open?
Yes, it can a gated ion channel is opened when a signal molecule binds to a receptor protein causing the receptor protein to open the ion channel through the cell membrane and after this process the ion channel is closed once again to prevent various molecules to enter the cell.
When the chemically gated ion channels open which ion is mainly responsible for depolarizing the sarcolemma?
The main ion responsible for depolarizing the sarcolemma is sodium (Na+).
