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Transcript
Name _________ 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 I ©Instructional Fair, Inc.