-
consists of brain, sp cord, and nerves
nerv sys
-
constantly recieves signals abt changes in bd and ext environment
nerv sys
-
2 systems that coordinate activities of trillions of cells
endo, nerv sys
-
employs chem mess (hormones) to communicate w cells
endo sys
-
electr signals transmit mess at lightning speed
nerv sys
-
3 actions of nerv system
sensing, integrating, responding
-
nerv sys func that uses sense organs and nerve endings to detect changes inside and out
sensing
-
nerv sys func that processes info, relates to past, and determines appropriate response
intergrating
-
nerv sys func that issues commands to muscles and glands to initiate changes based on that info
responding
-
how fast do neurons grow during fetal development
250,000 per min
-
2 main divisions
cns, pns
-
cns relates to
brain and sp cord
-
pns relates to
vast network of nerves
-
study of nerves
neurobiology
-
motor efferent transmits
info form cns to rest of bd
-
afferent sensory division sends
nerve endings to cns
-
-
-
afferent somatic sensory carries
signals from skin, bones, jnts, and muscles
-
afferent visceral sensory carries
signals from viscera of heart, lungs, stom, and bladder
-
efferent somatic
vol movement skeletal muscle
-
autonomic motor eff automatically acts to
control bp, heart rate
-
efferent autonomic motor 2 division
sympathetic and para
-
sympathetic div arouses
bd for action
-
parasympathetic div has a
calming effect
-
2 types of cells are
neurons and neuroglia
-
neurons are
excitable, impulse-conducting cells that perform work
-
neuroglia does
protect neurons
-
neuroglia includes
glial cells, supportive cells
-
there are how many glial cells per neuron
50
-
5 major types of neuroglia
oligodendrocytes, edendymol, micoglia, astrocytes, schwann
-
oligodendrocytes
form my sheath in brain and sp cord that speed signal coordination
-
edendymol
line sp cord and cav of brain - secretes cerebrospinal fluid
-
microglia
perform phago, eat microorganisms and cell debris
-
astrocytes
most in bd, extend thru brain tiss, nourish neurons, form bld-brain barrier, attach neurons to bld vess, and structure support
-
schawnn
form my sheath around pns nerves, form neurilemma
-
have feet attached to cap/neur to funnel glucose from bldstrm to neur for nourishment
astro
-
join w endoth cells on walls of cap making a ___ _____ wall
semi permeable
-
o2, co2, and h2o allowed to cross semi perm mem in astro
|
|
