Ultramafic Igneous Rocks Are Composed Almost Entirely of __

question 24

Multiple Choice

Ultramafic igneous rocks are composed almost entirely of __.

• A) feldspar
• B) quartz
• C) ferromagnesian minerals
• D) calcite
• E) diamonds

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Definitions:

Agonist

A chemical or drug that binds to receptors in the brain and causes a reaction or response similar to a naturally occurring substance.

Absolute Refractory Period

a period immediately following the transmission of a nerve impulse when a neuron is not responsive to stimulation from another impulse.

Neurotransmitters

Chemical substances that transmit signals from one neuron to another across synapses.

Reuptake

The process by which neurotransmitters are taken back into the synaptic vesicles of the neuron after being released into the synaptic cleft.