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Q: Does norepinephrine cause threshold to be reached more quickly?
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What hormones would cause your heart to beat faster?

norepinephrine


What does a threshold stimulus cause?

Jesus


The minimum stimulus needed to cause a contraction is called the?

threshold stimulus


What is the minimal level of stimulus to cause a muscle contraction?

it is known as the threshold stimulus usually seen in tonic contraction


Can Concerta cause impotence?

absolutely. it increases norepinephrine, which has all sorts of negative effects down there.


What is the minimal impulse that can initiate a muscle contraction?

Threshold stimulusThe minimal level of stimulation required to cause a fiber to contract is called the THRESHOLD STILULUS.


What can cause mold to spread quickly?

1. moisture 2. moderate temperatures (ie. +4ºC to room temperature) 3. air circulation (only once mold has reached sufficient mass)


What effect does amphetamines have on norepinephrine?

Amphetamines are psychostimulant drugs of abuse and include methamphetamine, amphetamine and ecstacy or MDMA. Amphetamine drugs can effect norepinephine in several ways. Initially amphetamine drugs will cause a massive release of all monoamine neurotransmitters (dopamine, serotonin and norepinephrine) from the vesicles inside the presynaptic cleft of a neuron. Furthermore, amphetamine and methamphetamine (not MDMA) are very structurally similar to norepinephrine and can substitute, or move through, the norepinephrine transporter (NET) which regulates the amount of norepinephrine in the synapse. This can lead to dysregulation of the transporter so that it no longer functions properly. This can happen in several ways including internalization of the transporter inside the presynaptic cleft and/or phosphorylation of the transporter, which can essentially shut it off. This means that there is more norepinephrine in the synapse, which can bind to norepinephrine receptors and lead to the subjective (feeling), physiological, behavioral and neurobiological effects of amphetamine drugs.


Why would a person be taking norepinephrine?

Norepinephrine causes peripheral blood vessels to narrow while making coronary arteries dilate. It also increases the strength of heart beats. It can be used in cases of dangerously low blood pressure, such as during a myocardial infarction. Of course, excessive amounts of norepinephrine can cause hypertension and other problems, so it should only be taken while appropriately supervised.


What happens when the plasma glucose cocentration exceeds the renal plasma threshold?

It will cause the change of the alpha and beta cells


Can silver fillings in your teeth cause brain damage?

No, the level of mercury in them does not exceed the body's metal toxicity threshold which the level is not high enough to cause brain damage


What cause neuron to fire?

The neuron adds up all the excitatory and inhibitory inputs and fires when they reach its threshold of excitation.