Nervous System Flashcards
sympathetic
accelerator
2 branches of automatic system
sympathetic and parasympathetic
automatic system
all involuntary actions
somatic system
responsible for all voluntary actions
2 systems in peripherals
somatic and autonomic
how many pairs of nervous systems extend from CNS
31
peripheral nervous system
responsible for all other nerve processes that branch out from spine to receptors in muscles, glands, blood vessels and organs
2 parts of nervous system
central and peripheral
motor
activate body systems by sending messages back via peripheral nervous system
association
memory, thought and emotion
3 areas of brain
sensory, motor and association
sensory
receive impulses from sense organs via peripheral nervous system
2 main lobes of brain
R &L hemisphere
central nervous system
brain and spinal cord
parasympathetic
slows down
neurotransmitters
allow brain to interpret signals from periphery and respond mechanically
motor unit recruitment
activating right amount of muscles for the job
nerve impulses
activating nerves
motor unit
motor neuron that connects to muscle at end of motor plate
motor unites recruited by
size- small to large
strength of contraction
depends on number of muscle fibers needed
all or none
no partial contraction
3 basic roles
sensation, integrative, motor
layers of fascial connective tissue
epimysium, endomysium, perimesium
epimysium
wraps around whole muscle
ednomysium
around smaller individual fibers
brain
interprets messages from the peripheral nervous system
spinal cord
transfers messages in and out of CNS
neurons
impulses or messages passed though nervous system via nerve cells called neurons
2 types of neurons
motor neurons, sensory neurons
motor neurons
transient impulses from CNS to muscles and glands
sensory neurons
transmit impulses from PNS to CNS to be interpreted by brain
