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AP Psychology: Brain 3A Flashcards

Neurons, Nervous System, Endocrine system, etc.
Info from Barron's flashcards, and Myers Psychology book

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484180848Neuron-Neural cell -made up of specific structures: dendrites, cell body, axon and terminal buttons
484180849Dendrites-Root like parts of the cell that stretch out from the cell body -Dendrites grow to make synaptic connections with other neurons -Receive neurotransmitters from other neuron's terminal buttons through synapse (synaptic gap/cleft)
484180850Myelin Sheath-Fatty covering around the axon of some neurons that speed neural impulses -Protects and insulates the axon
484180851Axon-Wire like structure ending in the terminal button that extends from the cell body
484180852Schwann Cell-Forms the myelin sheath -regenerates the axon
484180853Terminal Buttons-Branched end of the axon that contains neurotransmitters - It sends the neurotransmitters to the receiving neuron's dendrites
484180854Neurotransmitters-Chemicals contained in terminal buttons that enable neurons to communicate -Neurotransmitters fit into receptor sites on the dendrites of neurons like a key fits into a lock
484180855Synapse (or synaptic gap/cleft)-Space between the terminal buttons of one neuron and the dendrites of the next neuron -terminal buttons and dendrites never touch
484180856Action Potential-Electric charge that spreads down the length of a neuron after the threshold is achieved -travels like a bullet from a gun
484180857ThresholdLevel of neurotransmitters required to "fire" a neuron
484180858All-or-None Principle-neuron either fires completely or doesn't fire at all -if the dendrites of a neuron receive enough neurotransmitters to push the neuron pass its threshold, the neuron will fire completely everytime
484180859Neural Firing-Electrochemical process -Electricity travels within the cell (moves from the dendrites to the terminal buttons- called action potential) and chemicals (neurotransmitters) travel between cells in the synapse. Electricity does not jump between the neurons
484180860Excitatory Neurotransmitters-Chemicals released from the terminal buttons of a neuron that excite the next neuron into firing
484180861Inhibitory Neurotransmitters-Chemicals released from the terminal buttons of a neuron that inhibit the next neuron from firing
484180862Agonists-Makes neurons fire (mimics neurotransmitters)
484180863Antagonists-Stops neural firing
484180864Reuptake inhibitors-blocks reuptake
484180865Reuptake-Any neurotransmitters that are left behind is reabsorbed by the sending neuron
484180866Acetylcholine (ACh)-enables muscle action, learning, and memory -Lack of it is associated with Alzheimer's disease
484180867Dopamine-influences movement, learning, attention and emotion -Lack of it is assoc. to Parkinson's; overabundance assoc. with schizophrenia
484180868Serotonin-neurotransmitter that affects mood, hunger, sleep and arousal -Lack of it is assoc. with clinical depression
484180869Norepinephrine-helps control alertness and arousal -under supply can depress mood
484180870Glutamate-major excitatory neurotransmitter -involved in memory -over supply overstimulates the brain and causes migraines and seizures
484180871GABA (gamma-aminobutyric acid)-Major inhibitory neurotransmitter -under supply is linked to seizures, tremors and insomnia
484180872Endorphins-Neurotrasmitter assoc. with pain control -blocks pain and boosts mood -Also involved in drug addictions
484180873Hormones-Chemical messengers manufactured by endocrine glands -travel through the bloodstream and affect other tissues -when acted on the brain, they influence our interest in sex, food and aggression
484180874Sensory Neurons-neurons that take info from the senses to the brain -responsible for transmitting neural impulses from the rest of the body to the brain
484180875Interneurons-process information from sensory neurons -there are billions in our body
484180876Motor Neurons-Neurons that take info from the brain to the rest of the body -carry info that exits the brain - has to do with movement of muscles
484180877Central Nervous System (CNS)-Part of the nervous system that consists of our brain and spinal cord -all the nerves are housed within bone (skull and vertebrae)
484180878Spinal Cord-a bundle of nerves that run through the enter of the spine -transmits info from the rest of the body to the brain
484180879Peripheral Nervous System (PNS)-all the nerves in your body other than the brain and spinal cord; all nerves not encased in bone -divided int two categories: somatic and autonomic
484180880Somatic Nervous System-controls voluntary muscle movements
484180881Autonomic Nervous System-controls the automatic functions of the human body (heart, lungs, internal organs, glands, etc.) -controls responses to stress (fight vs flight response that prepares the body to respond to a perceived threat) -divided into two categories: sympathetic and parasympathetic
484180882Sympathetic Nervous System-Mobilizes our body to respond to stress -carries messages to control the organs, glands, and muscles that direct the body's response to stress -alert system of the human body. Accelerates some functions (heart rate, blood pressure, perspiration) but conserves energy by slowing down digestion
484180883Parasympathetic Nervous System-responsible for slowing down the body after a stress response -carries messages to stress response system that causes body to slow down
484180884Endocrine System-system of glands that secrete hormones -slow, but lingers on after danger passes
484180885Pituitary Gland-endocrine system's mater gland -influenced by hypothalamus -regulates growth and controls other endocrine glands
484180886Sir Charles SherringtonNoticed that neural impulses took longer than we thought it would -came up with theory of synapse
484180887Phrenologytheory that claimed bumps on the skull could reveal our metal abilities and our character traits
484180888NervesBundles of axons ("cables")
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