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What are two possible fates for a igneous rock?

Two of the most common fates of igneous rocks are to become sediment (and later sedimentary rocks) or to become metamorphic rocks.


Are neurotransmitters that depress the resting potential called excitatory?

No, neurotransmitters that depress the resting potential are called inhibitory neurotransmitters. Excitatory neurotransmitters have the opposite effect, causing depolarization and increasing the likelihood of an action potential.


Certain mental problems are thought to be caused by not having enough neurotransmitters. Why would a lack of neurotransmitters cause problems?

Neurotransmitters send signals from neuron to neuron


What primary neurotransmitters are involved in schizophrenia?

The primary neurotransmitters involved in schizophrenia are dopamine and glutamate. Excess dopamine activity is thought to contribute to positive symptoms like hallucinations and delusions, while abnormalities in glutamate may lead to cognitive deficits and negative symptoms. Other neurotransmitters like serotonin and GABA are also implicated in the disorder.


When are neurotransmitters released?

Neurotransmitters are released when an action potential reaches an axon terminal (aka: end foot, synaptic knob, bouton), causing voltage-gated calcium ion gates to open, allowing calcium ions into the axon terminal, which causes vesicles containing the neurotransmitters to fuse to the cell membrane, which creates an opening to release the neurotransmitters into the synapse.