Bio Psych 2.2 – Flashcards
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"Second messengers" carry their messages to ____.
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areas within the postsynaptic cell
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Releasing hormones are synthesized in the ____ and released in the ____.
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hypothalamus; anterior pituitary
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COMT and MAO are ____.
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enzymes that convert catecholamines into inactive chemicals
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The catecholamines include ____.
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epinephrine, norepinephrine, and dopamine
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Receptor molecules for neurotransmitters that exert metabotropic effects are proteins that bind to ____ outside the membrane, and attach to ____ inside the membrane.
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neurotransmitters; G-proteins
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When an action potential reaches the end of an axon, the depolarization causes what ionic movement in the presynaptic cell?
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calcium into the cell
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Adrenocorticotropic hormone (ACTH) controls secretions of the ____.
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adrenal cortex
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Glutamate opens sodium gates, enabling sodium ions to enter the postsynaptic cell. What type of effect is this?
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ionotropic
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When an action potential reaches the end of an axon, it evokes the release of neurotransmitters by opening ____ channels in the axon terminal.
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calcium
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The anterior pituitary is composed of ____ and the posterior pituitary is composed of ____.
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glandular tissue; neural tissue
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Hormones exert their effects ____.
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similarly to metabotropic neurotransmitters
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Which category of chemicals includes adenosine and several of its derivatives?
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purines
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A hormone is a chemical that is ____.
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conveyed by the blood to other organs, whose activity it influences
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What happens to acetylcholine after it attaches to a receptor on the postsynaptic cell?
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it is broken down into two components
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You are eating a food containing tryptophan. What can you consume with it to increase its entry to the brain?
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carbohydrates
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Avoiding foods with lecithin, such as eggs and peanuts, would affect the levels of which neurotransmitter the most?
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acetylcholine
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Compared to ionotropic effects, metabotropic effects are ____.
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slower and longer lasting
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Many neurons release neuropeptides mostly from the ____.
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dendrites
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A receptor can directly open a channel and thereby exert a(n) ____ effect, or it can produce slower but longer ____ effects.
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ionotropic; metabotropic
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In general, a single neuron releases ____ neurotransmitter(s) and can respond to ____ neurotransmitter(s).
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several; many
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The basic building blocks for the majority of neurotransmitters are ____.
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amino acids
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Which neurotransmitter is released by stimulated neurons to dilate the blood vessels?
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nitric oxide
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Which event is most likely to be dependent on ionotropic effects?
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rapid muscle contraction
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What happens when a neurotransmitter is released by a presynaptic cell?
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the neurotransmitter passively spreads across the synaptic cleft
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A metabotropic synapse, by way of its second messenger, ____.
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can influence activity in much or all of the postsynaptic cell
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Neuropeptides are synthesized in the ____.
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cell body
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The main advantage of a neuron releasing more than one neurotransmitter is that:
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it can send more complex messages
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The presynaptic terminal stores high concentrations of neurotransmitter molecules in ____.
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vesicles
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A drug that inhibits the action of the enzyme acetylcholinesterase will have the effect of ____.
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prolonging the action of acetylcholine at its synapses
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What is the synaptic cleft?
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the gap between the presynaptic neuron and the postsynaptic neuron
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Which terms refers to a chemical that binds to another chemical?
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ligand
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Activation of autoreceptors tends to ____.
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decrease further neurotransmitter release
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What is the function of the enzyme acetylcholinesterase?
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it breaks acetylcholine down into components for recycling
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Loewi demonstrated that synapses operate by the release of chemicals by ____.
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collecting fluid from a stimulated frog's heart, transferring it to another frog's heart, and measuring that heart rate
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Autoreceptors monitor the ____.
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amount of neurotransmitter released
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In addition to influencing other neurons, ____ increases blood flow to a specific area of the brain.
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nitric oxide
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A neuron excretes neurotransmitters through its membrane by a process called ____.
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exocytosis
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Ionotropic effects are characterized by ____.
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rapid and short-lived effects
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"Transporter" proteins transport neurotransmitters ____.
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back into the presynaptic neuron
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The primary method for disposal of peptide neurotransmitters is ____.
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diffusion
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The effect of a neurotransmitter on a postsynaptic neuron is determined by the ____.
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receptors on the postsynaptic membrane
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Ionotropic effects ____.
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may depolarize or hyperpolarize the postsynaptic membrane
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The amino acid tryptophan is the precursor to which neurotransmitter?
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serotonin
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Although slower than an action potential, synaptic transmission is still relatively fast because ____.
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the synaptic cleft is very narrow
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What makes nitric oxide unique among neurotransmitters?
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it is a gas