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What happens to the net concentration of sodium ions during the resting membrane potential?
During the resting membrane potential, the net concentration of sodium ions remains constant. The Na+/K+ pump works to actively transport sodium out of the cell and potassium into the cell, maintaining the resting membrane potential.
What happens to the muscle membrane when acetylcholine binds to receptors at the motor plate?
When acetylcholine binds to receptors at the motor plate, this binding opens ligand-gated ion channels on the motor end plate, ions diffuse through the open ligand gated ion channels, and the flow of ions causes the motor end plate to reach threshold and an action potential is generated at the motor end plate.
What is the correct sequence of events that follows a threshold potential?
§Labor and management§Productivity§Wage levels§Training needs§Local infrastructureMeasuring site potential in step 3 involves determining whether a site can supply adequate resources needed to carry out the proposed business activity. Key issues include:•For many companies the most important resources will be labor and management.•The productivity and wage levels of local labor and managers.•The cost of training local managers, which can mean substantial investments of time and money.•And the efficiency of local infrastructures, including roads, bridges, airports, seaports, and telecommunications systems.
What happens when a resting neuron's membrane depolarizes?
When a resting neuron's membrane depolarizes, it becomes more positive due to an influx of positively charged ions like sodium. This change in membrane potential triggers an action potential, leading to the propagation of electrical signals along the neuron.
What happens when binding acetylcholine to the chemically gated ion channels on the plasma membrane of the muscle fiber?
When acetylcholine binds to the chemically gated ion channels on the plasma membrane of the muscle fiber, it causes these channels to open, allowing sodium ions to flow into the cell. This influx of sodium ions depolarizes the muscle fiber membrane, generating an action potential. The action potential then triggers the release of calcium ions from the sarcoplasmic reticulum, ultimately leading to muscle contraction.
What happens when you open the sodium channels in the membrane of a neuron?
When this occurs, the membranes potenial drops, as potassium and sodium diffuse with their gradient.
Why Sodium and potassium ion can only cross in axon membrane through protein channel explain why?
At rest sodium in the outside and potassium on the inside as action potential propagate along the axon, depolirization happens and sodium channel opens and allow sodium ions to flood into the neurone. A wave of deporization spread along the neuron, the neuron membrane contain specialised protein called channels. the channel from pore.
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.
What happens to the net concentration of sodium ions during the resting membrane potential?
During the resting membrane potential, the net concentration of sodium ions remains constant. The Na+/K+ pump works to actively transport sodium out of the cell and potassium into the cell, maintaining the resting membrane potential.
What happens to the muscle membrane when acetylcholine binds to receptors at the motor plate?
When acetylcholine binds to receptors at the motor plate, this binding opens ligand-gated ion channels on the motor end plate, ions diffuse through the open ligand gated ion channels, and the flow of ions causes the motor end plate to reach threshold and an action potential is generated at the motor end plate.
What is the correct sequence of events that follows a threshold potential?
§Labor and management§Productivity§Wage levels§Training needs§Local infrastructureMeasuring site potential in step 3 involves determining whether a site can supply adequate resources needed to carry out the proposed business activity. Key issues include:•For many companies the most important resources will be labor and management.•The productivity and wage levels of local labor and managers.•The cost of training local managers, which can mean substantial investments of time and money.•And the efficiency of local infrastructures, including roads, bridges, airports, seaports, and telecommunications systems.
What happens when a resting neuron's membrane depolarizes?
When a resting neuron's membrane depolarizes, it becomes more positive due to an influx of positively charged ions like sodium. This change in membrane potential triggers an action potential, leading to the propagation of electrical signals along the neuron.
What happens in each of the five phases of cardiac muscle depolarization?
PHASE0(RAPID DEPOLARIZATION) due to opening of fast voltage gated sodium channels PHASE1(INITIAL REPOLARIZATION) due to closure of sodium channels while loss of potassium is goingon ,making the cell polarized. PHASE2(PLATEAU) due to opening of calcium channels. influx of calcium neutralizes the effect of out going potassium so prolonged plateau is achieved. PHASE3(FINAL RE POLARIZATION) due to closure of calcium channels and continue loss of potassium makes the inside of cell more negative resulting in polarization. PHASE4(RMP) eventually cell returns to resting membrane potential due to K efflux and cell is ready for next cycle
Depolarization would occur.....a-sodium cations leave the cell b-potassium cations leave the cell c--chloride anions enter the cell d-calcium cations enter the cell?
In a polarized cell membrane there are an excess of sodium cations outside the cell and a relative abundance of potassium cations inside the cell. When a cell depolarizes, sodium ions rush into the cell causing the interior surface of the cell membrane to become slightly more positive, i.e. depolarized. When this happens it triggers potassium channels to open allowing potassium ions to flow out repolarizing the cell. While not completely correct, the best answer of your choices here would be b - potassium cations leave the cell.
What exactly happens in phase 4?
Phase 4 of cardiac action potential involves rapid ventricular repolarization, as the potassium channels open and potassium ions flow out of the cell. This leads to the restoration of the resting membrane potential. The cell is then ready for the next cycle of depolarization and contraction.
What happens in the nerve when the sodium channels stay open?
When sodium channels stay open, sodium ions continue to flow into the nerve cell, depolarizing the cell membrane. This depolarization can trigger an action potential, leading to the propagation of the electrical signal along the nerve. If the sodium channels remain open for an extended period, it can disrupt the normal balance of ions across the cell membrane, affecting the nerve's ability to transmit signals accurately.
What is the physical mechanism leading to the electrical impulse action potential in an axon?
It is called depolarization and happens when sodium and/or calcium ions enter the cell rapidly through their respective voltage-dependent ion channels or potassium ions stop leaving the cell through their ion channels or chloride ions stop entering the cell through their ion channels.
