Test 4 Flashcards
(132 cards)
system of the body that coordinates the activities of the body
nervous system
______ includes the brain and spinal cord
central nervous system
the principal organ of the nervous system
brain
thick bundle of nerve fibers located within the spinal cavity
spinal cord
triple layer of protective tissues that covers the brain and spinal cord
meninges
________ is a liquid that cushions the brain when you bump your head
cerebrospinal fluid
______ are cells that support and insulate nerve tissue
glial cells
actual nerve cells
neurons
found within the brain and spinal
cord consists largely of the cell bodies of neurons
gray matter
composed of axons and glial cells that are white; found in the brain and spinal cord
white matter
mass of cell bodies
ganglia
group of cell bodies in the brain or spinal cord
nerve center
neurons that transmit information to the central nervous system from the senses of sight, hearing, taste, touch, and smell, as well as those that transmit pain signals
sensory neurons
neurons that relay signals from the central nervous system to the other parts of the body
motor neurons
walls that protect the central nervous system from being permanently damaged every time you get sick
blood-brain barrier
disease that occurs when microorganisms enter the nerve tissue and infect the meninges
meningitis
disease that attacks the spinal cord and destroys the motor neurons
polio
system of the body that consists of nerves
peripheral nervous system
bundles of nerve fibers branching from the brain and spinal cord and connecting the central nervous system to the extremities of the body
nerves
nerves containing both sensory and motor fibers
mixed nerves
part of the peripheral nervous system that controls the heart and other internal organs
autonomic nervous system
division of the autonomic nervous system that responds to your body’s needs during increased activity and emergency situations
sympathetic division
division of the autonomic nervous system that counteracts the actions of emergency situations
parasympathetic division
true or false: nerve cells rarely reproduce
true