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What is the significance of the plateau phase seen in the action potential of cardiac muscle cells?
Wiki User
∙ 11y ago
calcium channels remaning open.
Wiki User
∙ 11y ago
Wiki User
∙ 11y agoi dont known
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The plateau portion of the action potential in contractile cardiac muscle cells is due to?
Slow inward diffusion of Ca2+
An electrical impulse moving down an axon is called?
This is called action potential. Action potential is the change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated, serving to transmit nerve signals.
What is the difference between a compound action potential and a single action potential?
Single action potentials follow the "all or none" rule. That is, if a stimulus is strong enough to depolarize the membrane of the neuron to threshold (~55mV), then an action potential will be fired. Each stimulus that reaches threshold will produce an action potential that is equal in magnitude to every other action potential for the neuron. Compound action potentials do not exhibit this property since they are a bundle of neurons and have different magnitudes of AP's. Thus compound action potentials are graded. That is, the greater the stimulus, the greater the action potential.
What is the duration of action potential of skeletal muscle?
Action potential duration in skeletal muscle is around 2 - 5 milliseconds.
When can a second nerve impulse cannot be generated?
The generation of a second action in some neurons can only happen after a refractory period, when the membrane potential has returned it's base level or even more negative. This is because some types of Na+ channels inactivate at a positive potential and then require a negative potential to reset. Other neurons have other types of channels and can fire multiple action potentials to a single depolarization.
The plateau portion of the action potential in contractile cardiac muscle cells is due to?
Slow inward diffusion of Ca2+
Why do you keep the heart from entering tetanus?
The action potential of cardiac muscle is prolonged consisting of the depolarization spike and plateau and a repolarization period. The action potential causes a long refractory period of about 250-400 milliseconds in the heart.
Why is the cardiac action potential longer?
The reason why cardiac muscle has a longer action potential is to extend the absolute refractory period to prevent another action potential. If too many action potentials stimulate the cardiac muscle it can get into tetanus which keeps the heart continuously contracted without relaxation.
What effect does hypocalcemia have on the cardiac action potential?
It can prolong the cardiac action potential. It can also have other effects, such as torsades de pointes,and it can mask digitalis toxicity.
What phase of cardiac muscle action potential caused by sodium ions entering cell?
The first phase of a cardiac action potential (or any action potential) involves influx of sodium ions. This phase may be called:The rising phaseThe depolarization phasePhase 0
What is automaticity of the heart?
The property that allows any cell in the cardiac muscle to begin an action potential, or a cardiac conduction, leading to cardiac contraction.
What is trigger calcium?
In the fast response action potential of cardiac muscle, the sarcolemma rapidly depolarizes and reaches a plateau. In the plateau phase, Ca2+ released by the glycocalyx comes into the muscle cell from the extracellular fluid. This Ca2+ is called "trigger Ca2+" because it induces the release of Ca2+ from the sarcoplasmic reticulum.
What is the function of the intercalated disc?
Basically, the cardiac action potential travel across them, making it easier for the electrical impulses to move quickely.
In cardiac muscle the fast depolarization phase of action potential is the result of?
increased membrane permeability to sodium ions
Allow spread of action potential between cardiac fibers?
Visceral Muscle Tissue or Visceral Smooth Tissue is a cardiac muscle. Its gap junctions allows actions that is likely to disseminate from one cell to another.
What is the significance of using conventional and non conventional sources?
using significans you can answer what the kinetic and potential do to a certain action or moving direction thank you
Why couldn't your heart have cardiac tissue?
Cardiac muscle, like other muscles, can contract, but it can also carry an action potential (i.e. conduct electricity), like the neurons that constitute nerves. Furthermore, some of the cells have the ability to generate an action potential, known as cardiac muscle automaticity. (Some cells can make the heart beat on its own.) This doesn't occur in any other type of muscle tissue. This ability can keep the heart pumping even under disease conditions.
