Unit 1 Flashcards
Nature
Heredity: DNA, Chromosomes, inherited brain chemistry
Nurture
Environmental factors: family interactions, where you live, education, diet, pregnancy
Genetic Predisposition
Increased likelihood of developing a disease based on genetic makeup
Evolutionary Perspective
The study of the evolution of behavior and the mind using principles of natural selection
Natural Selection
Inherited traits that enable an organism to survive, survival of the fittest
Eugenics
Pseudoscientific view that the genetic makeup of the population can be improved by selective breeding, preventing reproduction by people with various ability
Twin Studies
Identical twins separated at birth can determine impact of nurture, fraternal twins raised together can determine differences due to nature
Family Studies
Research conducted among siblings, parents and children can assess evidence for genetic links
Adoption Studies
Investigates relationships among genetic and environmental factors in the development
- Parent - child pairs
Nervous System Breakdown
Central Branch and Peripheral Branch
Central Nervous System
Brian and spinal cord
- brain: command center
- spinal cord: sends messages to and from the brain (handles fast reflexes)
Peripheral System Breakdown
Somatic and Autonomic Systems
Somatic System
- Carries motor messages from brain to skeletal muscles (motor efferent neurons)
- Messages to brain from sense organs (sensory afferent neurons)
Autonomic System
Controls glands and muscles of internal organs
- Breathing
- Pupil dilation
- heart beat
- digestion
Autonomic System Breakdown
Sympathetic and Parasympathetic systems
Sympathetic system
flight or flight
Parasympathetic system
rest and digest
- returns body to homeostasis
Neurons
Transmits information
- sensory
- motor
- interneurons
(like a queen bee, cannot feed or protect themselves)
Glial Cells
structure, insulation, communication, waste transportation (like worker bees, provide structure)
Ex: Schwann cells
Reflex Arc
Simple automatic response to sensory stimulus BEFORE stimulus reaches the brain
Neural transmission
the transfer of info between 2 neurons
Communication used by neurons
electrochemical signals transmitters at the synapse
- either excite or inhibit neuron from firing action potential
communication used WITHIN neurons
electrical signals, action potentials
- send info from cell body to axon terminals
Resting potential
Neuron at rest, inside of neuron membrane is negatively charged compared to the outside
Threshold
minimum intensity needed to trigger an action potential (neural impulse)
Action potential
neural impulse
- electrical charge that travels down the axon
Depolarization
movement of the cells membrane potential to a more positive value
All or nothing principle
a neuron will either fire with full strength or not at all
refractory period
a brief resting pause that occurs after a neuron has fired; subsequent action potentials cannot occur until the axon returns to it’s resting state
neurotransmitter
chemical messengers of the nervous system
- degraded by enzymes in synaptic space
- reuptake THEN repackaged for reuse
reuptake
the reabsorption or a neurotransmitter by the pre synaptic neuron
multiple sclerosis
disease of CNS
- myelin sheath is destroyed causing slow down or death of neurons
(vision, movement and cognition)
myasthenia gravis
affects neuromuscular system
- receptor on neurons responsible for muscle contraction attacked by immune system
(muscles, speech, AcH)
Excitatory Neurons
increase the chances that the next chain will fire (achieve action potential)
Inhibitory Neurons
decrease the chances that the next neurons in the chain will fire
Hormones
chemical messengers of the endocrine system
- regulate growth, hunger, sleep, immune response, sexual motivation
Adrenaline
fight or flight (adrenal glands)
Leptin
hunger suppressants (stomach)
Ghrelin
hunger stimulant
- Ex: growling stomach
Melatonin
sleep
Oxytocin
3 Ls; labor, lactation, love
Acetylcholine Function (excitatory)
CNS: Attention, learning, memory
PNS: Musclee contractions
- slow acting neurotransmitters
ACh Deficit
Dementia, paralysis
ACh Surplus
Spasm, cramps
Norepinephrine Functions (excitatory)
CNS: alertness, attention
PNS: fight or flight
Norepinephrine Deficit
depressed mood, attention and focus issues
Serotonin Function (excitatory and inhibitory)
CNS: mood, hunger, sleep, arousal
PNS: modulates pain signals
Serotonin Deficit
depression
Dopamine Function (excitatory and inhibitory)
CNS: voluntary movement regulation, emotions, motivations, pleasure, reward
Dopamine deficit
tremors, decreased mobility (Parkinson’s)
Dopamine Surplus
hallucinations (schizophrenia)
GABA Function (Inhibitory)
most abundant inhibitory neurotransmitter
- sleep regulation
GABA Deficit
anxiety, seizures, insomnia, Huntington’s disease
GABA Surplus
sedation, lack of coordination, memory impairment
Endorphines (inxibitatory)
inhibit pain, transmission, indirectly increase pleasure
endorphin deficit
pain
endorphin surplus
euphoria (but if induced chemically, a suppression or end of production)
substance p functions (excitatory)
modulates pain
substance p surplus
chronic pain
glutamate function (excitatory)
most abundant excitatory neurotransmitter
- involved in memory
glutamate surplus
migraines, seizures, anxiety
Psychoactive drugs
chemicals that alter Brian function by interacting with neurotransmitter systems
agonist
enhances the effect of a neurotransmitter
agonist
prevents the effect of a neurotransmitter (occupies post synaptic neuron)
reuptake inhibitor
enhances the effect of neurotransmitters by blocking its reuptake (excess amount of neurotransmitters in synapse)
Stimulants
increased neural activity
Ex: caffeine and cociane
Caffeine
increased concentration, alertness, elevated mood, anxiety, disrupts sleep
Cocaine
increased energy, euphoria, heightened alertness, anxiety paranoia and crash
reuptake inhibitor for norepinephrine (alertness), dopamine (reward system), seratonin (euphoria)