Unit 2 Biopsychology Flashcards
Nature and Nurture Issue
Genes and experience allow for the development of psychological traits. Personality arises from the interaction of nature AND nurture.
Natural Selection
Inherited traits enable an organism to survive and reproduce in a particular environment will most likely be passed on to the succeeding generations.
Eugenics
Selective breeding of humans to promote certain “positive” characteristics and eliminate “negative” characteristics.
Evolutionary Psychology
The study of the evolution of behavior and the mind, using principles of natural selection.
Mutation
Random errors in gene replication that leads to a change.
Heredity
Genetic or predisposed characteristic that is transferred from parents to offspring, influencing physical, behavioral, and mental traits and processes.
Family Studies
Search for traits and diseases that tend to be shared by family members.
Twin Studies
Assess effects of shared genes and environments in twins.
Adoption Studies
Assess the effects of environment in adopted children and their biological parents.
Genetic Predisposition
Nervous System
Communication network in the body that consists of all the nerve cells of the CNS and PNS.
Central Nervous System
Includes brain and spinal cord. “Decision maker.”
Peripheral Nervous System
Gathers information and transmits CNS decisions to other body parts.
Nerves
Electrical cables from from bundles of axons. They link the CNS with the body’s sensory receptors, muscles, and glands.
Sensory (Afferent) Neurons
Carry incoming information from the skin/tissues and sensor receptors to the brain and spinal cord for processing.
Motor (Efferent) Neurons
Cary instructions from the CNS to the body’s muscles and glands to produce a reaction to stimulus.
Interneurons
Communicate internally and process information between sensory inputs and motor outputs.
Somatic Nervous System
Part of PNS that enables voluntary control of skeletal muscles.
Automatic Nervous System
Part of PNS that controls involuntary movement, such as your heart beating.
Sympathetic Nervous System
Part of autonomic system that arouses and expends energy. Fight, flight, or freeze.
Parasympathetic Nervous System
Part of autonomic system that calms the body and conserves energy. Breed, feed, rest, digest. Works with sympathetic to maintain homeostasis.
Spinal Cord
Bridge between the brain and the PNS.Fibers send up sensory information and then send back motor-control information.
Reflex
Automatic responses to stimuli.
Reflex Arc
Spinal reflex pathway. Stimulus causes sensory neurons to emit signals to the CNS with inter neurons, and a response is carried out through motor neurons.
Neuron
A nerve cell. The basic building block of the nervous system.
Cell Body
Part of neuron that contains the nucleus.
Dendrites
Busy fibers on neruons that integrate information, conducting impulses toward the cell body.
Axon
Segmented neuron extension that passes messages through its branches to other neurons or to muscles or glands.
Terminal Branches
At the bottom of the neuron, forms junctions with other cells.
Myelin Sheath
Layer of fatty tissue around axons that insulates and speeds up impulses.
Multiple Sclerosis
Auto-immune disease, attacks the myelin (out coating of the nerve).
Glial Cells
Cells in the nervous system that support, nourish, and protect neurons; they may also play a role in learning, thinking, and memory.
Action Potential
A neural impulse; a brief electrical charge that travels down an axon.
Ions
Electrically charged atoms.
Resisting Potential
Positive-outside/negative-inside state between and axon’s membrane and a resting axon’s fluid interior.
Depolarization
Loss of the inside/outside charge difference between an axon’s membrande and fluid.
Excitatory
Most neural signals “push a neuron’s accelerator.”
Inhibitory
Some neural signals “push a neuron’s brake.”
Threshold
The level of stimulation required to trigger a neural impulse.
Refractory Period
In neural processing, a brief resting pause that occurs after a neuron has fired; subsequent action potentials cannot occur until the axon returns to its resting state.
All-or-None Response
A neuron’s reaction of either firing or not firing.
Reuptake
A neurotransmitter’s re-absorption by the sending neuron.
Synapse
The junction between the axon tip of the sending neuron and the dendrite or cell body of the receiving neuron.
Synaptic Gap (Cleft)
The tiny gap at the synapse.
Neurotransmitters
Chemical messengers that cross the synaptic gaps. They travel across the synapse and bind to receptor sites on the receiving neuron, influencing the response of that neuron.
Acetylcholine
Neurotransmitter that enables muscle action, learning, and memory.
Dopamine
Neurotransmitter that influences movement, learning, attention, and emotion.
Serotonin
Neurotransmitter that affects mood, hunger, sleep, and arousal.
Nonrepinephrine (Noradrenaline)
Neurotransmitter that helps control alertness and arousal.
GABA (Gamma-Aminobutyric Acid)
Major inhibitory neurotransmitter.
Glutamate
Major excitatory neurotransitter; involved in memory.
Endorphins
Neurotransmitters that influence the perception of pain or pressure.
Substance P
Involved in pain perception and immune response.
Myasthenia Gravis
Auto-immune neuromuscular disease in which muscles cannot contract, attacks receptor sites.
Agonist
Molecule that increases a neurotransmitter’s action.
Antagonist
Molecule that inhibits or blocks a neurotransmitter’s action.
Endocrine System
Body’s “slow” chemical communication system; a set of glands and fat tissue that secrete hormones into the bloodstream.
Hormones
Chemical messengers that are manufactured by the endocrine glands, travel through the bloodstream, and affect other tissues.
Epinephrine (Adrenaline)
Hormone that increases heart rate, blood pressure, and blood sugar, providing energy to power fight or flight response.
Pituitary Gland
Small structure in the core of the brain, controlled by the hypothalamus. Releases hormones including growth hormones that stimulate physical development, as well as oxytocin.
Oxytocin
Neural Communication
Reputake Inhibitors
Psychoactive Drug
Chemical substance that alters the brain, causing changes in perceptions and moods.
Depressants
Drugs like alcohol, tranquilizers, and opioids that calm neural activity and slow body functions.
Alcohol
Depressant that acts as a disinhibitor to slow brain activity that controls judgement and inhibitions. (Slows sympathetic Nervous system activity).
Tolerance
Developed through continued use of alcohol or other drugs. Brain chemistry adapts to offset the drug effect.
Addiction
Caused by increasing doses of many psychoactive drugs, the user craves the drug and struggles to withdraw from it.
Opioids
Depress neural activity, temporarily lessening pain and anxiety.
Withdrawl
Unpleasant mental or physical reactions when attempting to end use.
Heroin
Depressant that causes pain relief, but also depression and a loss of endorphin function.
Stimulants
Drugs that excite neural activity and speed up body functions.
Cocaine
Powerfully addictive stimulant that depletes the brain’s supply of dopamine, serotonin, and norepinephrine.
Hallucinogens
Psychedelic drugs that distort perceptions and evoke sensory images in the absence of sensory input.
Mirijuana
Contains THC and amplifies sensitivity to colors, sounds, tastes, and smells. Effects may linger for over a week.
Caffiene
Stimulant that increases alertness and wakefulness but may cause anxiety, and insomnia.
Biological Psychology
Study of the links between biological and psychological processes.
Biopsychosocial Approach
Integrated approach that incorporates biological, psychological, and social-cultural levels of analysis.
Neuroplasticity
Brains ability to change, especially during childhood, by building new pathways based on experience.
Lesion
Tissue destruction that may occur naturally, during surgery, or experimentally.