Unit II - Biological Psychology Flashcards
Biological Psychologist
researches brain functions to understand behavior
Chromosomes
- thread-like structures
- made of protein
- a single molecule of DNA
DNA
- nucleic acid
- contains genetic instruction
- used for development and functioning
Genes
- basic unit
- genetic info is stored and passed between generations
Natural Selection
- Charles Darwin
- process in which competition, disease, and climate eliminate weak
Mutations
permanent change in genetics
Behavior Genetics
genetic variation affects traits
Twin Studies
studies conducted on twins
Endocrine System
glands that produce hormones
Hormone
chemical messengers that influence nervous system to regulate behavior
Pineal Gland
regulates body’s circadian rhythm
Pituitary Gland
regulates vital body functions/general well-being
Adrenal Gland
regulates metabolism, immune system, blood pressure
Hypothalamus
- contains nuclei
- automatic functions
Spinal Cord
connects our brian to body
Spinal Reflex
simple behaviors in spinal cord
Somatic Nervous System
voluntary control of body movement
Autonomic Nervous System
regulates involuntary body movements
Sympathetic Nervous System
fight-or-flight response
Fight or Flight
automatic reaction to stressful event
Parasympathetic Nervous System
- network of nerves
- relaxes body after stress
Nucleus
- individual cells
- basic building block of nervous system
Cell Body / Soma
contains neurons and chemical machinery
Dendrites
- branch-like structures
- receives info from other neurons
Myelin Sheath
- fatty substance
- covers axon
- helps insulate
- protects and speeds up process
Node of Ranvier
short regions between axon covered by myelin sheath
Axon
- tube-like structures
- carries neural message away from soma to other cells
Axon Terminal
- small knobs
- produce neurotransmitters
Schwann Cell
- glial cell that surrounds neurons
Action Potential
brief shift in neuron’s charge that travels along axon
Stimulus Threshold
minimum intensity required from stimulus to produce a response
All-or-None Law
100% or 0%
Resting Potential
neuron’s state when it isn’t firing
Synapse
junction where info is transmitted from one neuron to another
Neurotransmitter
chemical messanger
Reuptake
neurotransmitters in synapse are reabsorbed