Chapter 4 Flashcards
Central nervous system (CNS)
the brain and spinal cord
Peripheral nervous system (PNS)
Portion outside of brain, sensory and motor nerves.
Parasympathetic Nervous System
Functions during relaxed state and conserves energy.
autonomic nervous system
regulates internal organs and glands
sympathetic nervous system
Mobilizes bodily response during emotion and stress
Glial cells
Support, nurture, insulate neurons, remove debris of died neurons
3 parts of a neuron
- Cell body: genetic material and keeps the neurons alive
- dendrite: receiving and send messages
- axon: conducts impulses away from the cell body and transmits to other neurons
Somatic nervous system
Contains receptors on skeletal muscles
Reticular activating system
Arouses cortex and screens incoming information
Neurogenesis
- Production of new growth of neurons from stem cells
- Stress = inhibit
- Nicotine = kills
Neurotransmitters:
Chemical substance released by transmitting neurons at synapse that alters activity of receiving neuron.
acetylcholine [at-seat-ol- Cole lean]
- muscle memory
-Serotonin
mood, pain, and sleep
Pons
Sleep, wake, and dreaming
Myelin sheath
- Fatty insulation surrounding neurons to speed up neural impulse.
- it is not fully developed until 20’s
Glutamate
- Major excitatory neurotransmitter in the brain, it is release by 90% of the brain’s neurons