Exam 3: A: Biological Psychology

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An experience can influence which genes are active or inactive. ​

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Describe an example to demonstrate that even if a gene is known to produce an undesirable result,a change in the environment can largely prevent that outcome.​

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​A dominant gene leads to PKU (phenylketonuria),a type of mental illness.However,a strict diet that lacks the amino acid phenylalanine allows the child to develop normally (or almost so).

​Neurons are cells in the nervous system that function to process information.Each neuron consists of three parts.Name and describe each of the three parts.

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​The cell body contains the nucleus of the cell.The dendrites are widely branching structures that receive transmissions from other neurons.The axon is a single,long,thin,straight fiber with branches near its tip.

Natural selection (evolution)acts on brain and behavior just as it does on the rest of the body.

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​Cocaine and amphetamine affect behavior by attaching to hormone receptors.

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The chemicals released by neurons at synapses are called ______.

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In most cases,neurons communicate at synapses by transmitting an electrical charge.

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​The question of how separate brain areas combine forces to produce the unified perception of a single object is called the ________ problem.

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​Some people can indicate where a visual stimulus occurred even though they weren't conscious of seeing it.

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​If a gene influences behavior,we can assume it alters brain development.

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The part of the nervous system most important for controlling the heart,digestive organs,and other organs is the __________.

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An axon can alter the speed or magnitude of its action potentials.

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The brain produces its own chemicals that attach to the same receptors as opiate drugs such as heroin and morphine.Those brain chemicals are called ______.​

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​An axon transmits an action potential in the same way that a copper wire transmits an electrical current.

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​Cocaine and other stimulants produce increased arousal.However,a few hours later the person feels somewhat depressed and lacking in energy.Explain why,with reference to neurons.

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​Janet suffers from severe epileptic seizures that are untreatable with medicine.Her doctor decides to cut her corpus callosum.Following surgery,her neuropsychologist conducts some tests to assess the effects of the surgery.During a divided visual field study,Janet sees words flashed to both of her visual fields and is asked to read the words.When some of the images are flashed,Janet experiences difficulty stating the word that was flashed.Explain which visual field presentation likely causes Janet the most difficulty when asked to state the word that was flashed and why.

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​Marijuana decreases the release of both excitatory and inhibitory neurotransmitters.

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An action potential remains equally strong as it travels on an axon from start to finish.​

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​A heritability of 1 indicates that genetic variation is responsible for all the observed differences in behavior.

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Ritalin (methylphenidate)affects the same synapses as cocaine,in the same way.​

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