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Biological Psychology
A branch of psych. concerned with the links between biology and behavior.
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Neuron
A nerve cell, the basic building block of the nervous system.
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Dendrite
The bushy, branching extensions of a neuron that receive messages and conduct impulses toward the cell body.
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Axon
The extension of a neuron, ending in branching terminal fibers, through which messages pass to other neurons or to muscles or glands.
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Myelin Sheath
A layer of fatty tissue segmentally encasing the fibers of many neurons.
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Action Potential
A neuron impulse; a brief electrical charge that travels down an axon.
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Threshold
The level of stimulation required to trigger a neural impulse.
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Synapse
The junction between the axon tip of the sending neuron and the dendrite or cell body of the receiving neuron.
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Neurotransmitters
Chemical messengers that traverse the synaptic gaps between neurons.
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Acetylcholine
A neurotransmitter that enables learning and memory and also triggers muscle contraction.
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Endorphins
"Morphine within" Natural, opiatelike neurotransmitters linked to pain control and to pleasure.
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Nervous System
The body's speedy, electrochemical communication network, consisting of all the nerve cells of the peripheral and central nervous system.
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Central Nervous System
The brain and spinal cord.
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Peripheral Nervous System
The sensory and motor neurons that connect the central nervous system to the rest of the body.
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Nerves
Neural "cables" containing many axons. These bundled axons, which are part of the peripheral nervous system, connect the central nervous system with muscles, glands, and sense organs.
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Sensory Neurons
Neurons that carry incoming information from the sense receptors to the central nervous system.
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Motor Neurons
Neurons that carry outgoing information from the central nervous system to the muscles and glands.
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Interneurons
Central nervous system neurons that internally communicate and intervene between the sensory inputs and motor outputs.
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Somatic Nervous System
The division of the peripheral nervous system that controls the body's skeletal muscles.
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Autonomic Nervous System
The part of the peripheral nervous system that controls the glands and the muscles of the internal organs.
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Sympathetic Nervous System
The division of the autonomic nervous system that arouses the body, mobilizing its energy in stressful situations.
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Parasympathetic Nervous System
The division of the autonomic nervous system that clams the body, conserving its energy.
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Reflex
A simple, automatic, inborn response to a sensory stimulus such as knee-jerk response.
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Neural Networks
Interconnect neural cells. With experience, networks can learn, as feedback strengthens or inhibits connections that produce certain results.
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Endocrine System
The body's "slow" chemical communication system; a set of glans that secrete hormones into the bloodstream.
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Hormones
chemical messengers, mostly those manufactured by the endocrine glands, that are produced in one tissue and affect another.
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Adrenal Glands
A pair of endocrine glands just above the kidneys.
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Pituitary Gland
The endocrine system's most influential gland. Under the influence of the hypothalamus the pituitary regulates growth and controls other endocrine glands.
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Lesion
Tissue destruction.
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Electroencephalogram
An amplified recording of the waves of electrical activity that sweep across the brain's surface.
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PET (positron emission tomography)
A visual display of brain activity that detects where a radioactive form of glucose goes while the brain performs a given task.
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MRI (functional resonance imaging)
A technique that uses magnetic fields and radio waves to produce computer-generated images that distinguish among different typed of soft tissue. Allows us to see structures within the brain. Show brain anatomy.
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fMRI (functional magnetic resonance imagining)
A technique for revealing blood flow and therefore brain activity by comparing successive MRI scans. She brian function
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