Download Spinal Cord and Reflex Act

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SPINAL CORD AND REFLEX ACT
Cross Section of Spinal Cord
Label the following parts of a spinal cord
on the cross-section diagram.
a. white matter
b. grey matter
c. dorsal root ganglion
d. nerve fibers
e. interneuron
f. synapse
g. sensory neuron
h. motor neuron
'
_d_
_b_
Reflex Act
a.
Label the following parts of a reflex
act on the diagram of a boy
stepping on a tack and jerking his
leg away.
_f_
a.
b.
c.
d.
e.
f.
sensory neuron
motor neuron
stimulus
spinal cord
receptor (in skin)
effector (muscle)
Fill in the blanks with the correct answers.
Suppose you stepped on a tack. You jerked your leg away
aware of what happened. The impulse traveled from th:
along a(an),S(r}S.OI"!::J
jumped across a(an)
neuron Into the
Sytt"j)fle-
another synapse to a lllO
fc r:
btfc C(.
Cf. C~'liar
you were
,the skin,
s,p..'?'tJ cW~he imoulse
to a(an)
_ltlt&r #lf,eU"~fhtn across
neuron. The impulse traveled along this nerve
e-(-(c ( Ia r in your leg. You jerked your leg away. Only a fraction
of a second later, acan)
i"'P"''t. traveled up your 5p1tt~al cc-cd. to
your b Ca, ,· L\
. But!you had 41 (:fc.~ reacted. This kind of
reaction is known as a(an) rtJ J.c, &.r~ . Reflex acts occur without thinking.
to a muscle,
Biology IF8765
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