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Action potentials can be generated by virtually all cells of the body because all cells possess cell membranes?
While all cells have cell membranes, action potentials are mainly generated by excitable cells like neurons and muscle cells due to the presence of voltage-gated ion channels. These channels allow for rapid changes in membrane potential, leading to the generation of action potentials. Non-excitable cells do not typically generate action potentials.
Why are most action potentials generated in response to a long stimulus that is above threshold?
Action potentials are generated in response to a long stimulus above threshold because it allows for the full development of the depolarization phase. This prolonged depolarization leads to the activation of voltage-gated sodium channels, triggering the rapid influx of sodium ions and initiating the action potential. A sustained stimulus ensures that the membrane potential remains above threshold for a sufficient time to generate an action potential.
What ion is the cause of excitatory post-synaptic potential?
The cause of excitatory post-synaptic potentials is the influx of sodium ions into the postsynaptic neuron. This influx of positive charge depolarizes the neuron, making it more likely to generate an action potential.
When argon is placed in a container of neon the argon spontaneously disperses throughout the neon because?
Diffusion
Can resting membrane potentials be positive?
Resting membrane potentials are typically negative, ranging from -40mV to -90mV. A positive resting membrane potential would be unusual and could indicate an abnormal cellular state or malfunction.
Why do action potentials propagate in one direction?
Action potentials propagate in one direction because of the refractory period, which is a brief period of time after an action potential where the neuron is unable to generate another action potential. This ensures that the signal travels in a linear fashion along the neuron and does not backtrack.
Action potentials can be generated by virtually all cells of the body because all cells possess cell membranes?
While all cells have cell membranes, action potentials are mainly generated by excitable cells like neurons and muscle cells due to the presence of voltage-gated ion channels. These channels allow for rapid changes in membrane potential, leading to the generation of action potentials. Non-excitable cells do not typically generate action potentials.
What is myocardial degeneration?
Senile myocardial degeneration is degeneration of the heart. Often a heart valve has to be replaced because of this degeneration.
How does a drug that increases the length of time required for the repolarization of pacemaker cells affect the heat rate?
would decrease the heart rate, because the pacemaker cells would generate fewer action potentials per minute
How does Myocardial Atrophy affect the heart?
Myocardial atrophy is a condition where the heart chambers decrease in size. The heart muscle atrophy or shrink because of cancer or other similar conditions.
Why is phosphurous stored in water?
Because it can spontaneously ignite in air.
What you mean by autorhythmicity?
The pacemaker is known as the SA node (sinotrial) and it generates action potentials to the AV node and then to the bundle of his down to the purkinje fibers. The branching of cardiac muscle tissue and the intercalated discs allow action potentials to propagate to other cardiac mt cells. The autorhythmicity of the heart is attributed to the fact that it creates its own action potentials from the SA node and can be generated independently from the rest of the body. The heart's autorhythmicity also prevents it from reaching tetanus (like a skeletal muscle does), because myocardial tissue only allows a certain amount of action potentials through before it reaches its absolute refractory period when it comes to a plateau and after the wave drops again and gets hit with another action potential it has already rested.
Why does pericarditis cause a reduction in cardiac output?
because the force of myocardial contraction weakens
Why doesn't a match spontaneously combust?
A match can't spontaneously combust because it need someone or something to strike it. It can't combust on it's own TRC
When was the Myocardial Perfusion Scan discovered?
It must have been before yesterday because I had one yesterday
Reactions that do not proceed spontaneously because they require energy from an outside source are called?
Endothermic
How did Sir Sandford Fleming die?
I belive it was because of a myocardial infarction but i am not sure.
