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What parts of the body make up the CNS?
Spinal cord and Brain
What are the parts that make up PNS?
- afferent nerves--sensory nerves
- efferent nerves--motor nerves
- muscle control and sensory relay
spine and brain
- most nerves
- carry messages between nerves
carry away messages
carry messages from sense organs to the CNS
carry messages from muscle to glands
why are there gaps between nuerons?
- synaptic gaps
- nuerotransmitters relay info from the nerve to another cell
- lock and key method
what division of the peripheral nervous system control voluntary response?
somatic divison: carries info to CNS to skeletal muscle
what part of the peripheral nervous system control involuntary responses?
- autonomic division regulates the the internal evironment
- CNS-->smooth mucles and glands
- carry messages from neuron to neuron
- found only in the CNS
- decision making nerves
which division of the nervous system is most closely associated with the fight or flight response?
sympathetic: increase vitals
- make up the myelin sheath to promote better signal transmission
Why do people with MS have problems controllign their muscle contractions?
- autoimmune disease
- The scar tissue or plaques form when the protective and insulating myelin covering the nerves is destroyed, a process called demyelination. Without the myelin, electrical signals transmitted throughout the brain and spinal cord are disrupted or halted.
What do drugs and alcohol interfere with when they "use"?
- prefrontal cortex, the lobes
explain: parasympathic and sympathetic=homeostasis
- sympathetic= increase of vital. speed up!
- parasympathetic=slow down vitals
both counteract each other to keep the body in check
- found in the base of precentral gyrus involved with speech ability
- when its damages people are mute
people have difficulty comprehending language when this part of the brain is damages
- 3 connective tissue membranes covering the CNS structures
- double layered sac that anchors the Brain in place
- holds the fluid inside
- keeps the blood from contaminating the fluid inside
4 ways that the brain is protected:
- blood brain barrier
central and peripheral nervous system
concerned with PNS
interpret incoming sensory information
conveys messages to the CNS
relay station for sensory information going to sensory cortex
regulates body temp, water balance, metabolism
controls skeletal muscle activity, balance, and equilibrium
- langauage comprehension
- voluntary movement
- decision making
hearing, balance, emotions, motivations
- controls wake-sleep cycle
- 2 hemispheres
- movement/ coordination
- swelling of the brain
- neurological detioration