Chapter 3 Flashcards
Phrenology
Theory linking mental ability to bumps on skull
A dendrite
is an extension of a neuron
Basic building block of nervous system
neuron
Message travels through a neuron in the
axon
myelin sheath
fatty layer covers axon speeding up neural impulses
neural impulse
brief electrical charge traveling down an axon carrying message
synaptic gap
space in between neurons
neurotransmitters
carry chemical messages
Re-uptake
Reabsorbs excess neurotransmitters
Ach purpose is
muscle movement
Endorphins
are natural neurotransmitters in the brain
Antogonists
block neurotransmitter activity
Agonists
mimic neurotransmitters
Nervous systems
control all systems
Peripheral nervous systems
neurons linking brain and spinal cord to bodies sensory receptors, glands and muscles.
Central nervous system
brain and spinal chord
nerves
sensory and motor axons
somatic system
controls skeletal muscles
autonomic nervous system (automatically)
regulates glands, muscles and internal organs
Sympathetic
Prepares for action (fight or flight) part of autonomic nervous system
Parasympathetic
Calms body part of autonomic nervous system
reflexes are
automatic responses to stimuli
endocrine system
controls bodies chemical communications
endocrine system secretes
hormones
pituitary gland
releases hormones and regulates growth (puberty)
lesion
destroys brain tissue
split brain procedures
corpus callosum is cut
EEG
involves electrical sweeping of brain activity
CT Scan
only uses x-rays
PET Scans
measure brain activity using glucose