Unit 3- Brain Flashcards
Interneuron
Communicate between motor and sensory neurons
- in brain and spinal chord
Axon
Where the electrical method takes place
- connects soma to axon terminal
Action potential
Where positive ions rush into the axon
Refractory period
Positive ions get kicked out
Motor neuron
Movement
Dendrite
Where a message enters the cell
Threshold
N
Reuptake
Neurotransmitter goes back into the axon terminal where it came from
Sensory neuron
Senses
Soma
Contains all cell parts
-cell body
All-or-None
Neuron can not partially fire, it completely fires or doesn’t fire at all
Glial cells
Cells that protect and nourish the neurons
Myelin sheath
Protects axon and helps message travel faster
Synapse
Gap/space between neurons
-dendrite of one and axon terminal of another
Resting potential
Negative ions are inside axon, positive ions are outside, no movement
Endorphins
Pain killing, make you happy, exercise
Glutamate
Excitatory- send messages forward
-if injured, can have seizures, migraines, sensitivity to light/sound
Epinephrine
Emergency (flight or fight), allergic reaction
-can get in depressed mood or have fatigue if injured
Dopamine
Movement, attention, learning, emotion
-if injured can cause parkinsons (shaking) disease or schizophrenia (delusions/paranoia)
Acetylcholine
Memory, muscle contraction
-if injures may cause Alzheimer’s disease or muscle paralysis
Serotonin
Mood, sleep, hunger, attention
-if injured, can cause depression or ADD/ADHD
GABA
Inhibitory -stops messages
-if injured, can cause seizures, tremor, or insomnia
Central NS
Info from body to brain
-brain and spine
Sympathetic NS
Stress response
-part of peripheral NS and autonomic
Peripheral NS
Off to side
-includes autonomic and somatic
Somatic NS
Body, voluntary motions
Autonomic NS
Automatic/involuntary body functions
Parasympathetic NS
Peace
Reflex
Automatic responses to stimuli
Hormones
Chemical messengers
Parathyroid gland
In neck, regulates calcium levels
Pituitary gland
In brain, controls growth and is master gland