THE NERVOUS SYSTEM Flashcards
One of many functions of the nervous system
Responding to stimuli
Evokes a person’s reaction
stimulus
Body’s ability to maintain constant internal equilibrium
HOMEOSTASIS
Basic cellular unit
Neuron
Transmits impulses to and from
Neuron
Three types of neurons
Sensory, motor, interneurons
Afferent/ send impulses
Sensory neurons
Efferent/ conduct impulses
Motor neurons
Scatted throughout/ relay impulses
Interneurons
Impulse to move from one neuron to another, it jumps across a space called __
synapse
Certain _ help in transporting the message
Chemicals
Chemical messengers are called
Neurotransmitters
Neurons contain _
Nissl bodies
The body sites of protein synthesis
Nissl bodies
Neuron lacking a Nissl body is called
Axon
Transmits impulses to motor neurons
Axon
Surrounds the axon
Myelin sheath
Composed of an axon and it’s myelin sheath
Nerve fiber
Made of bundled nerve fibers
Fiber tract
Is composed of bundles of nerve fibers outside the cns
Nerve
A fibrous sheath of cells
Epineurium
Shorter extension of the cell hody
Dendrite
Are transmitted from one neuron to another through synapse
Nerve impulses
