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- What is the importance of acetylcholinesterase in thesynaptic cleft? What would occur if acetylcholinesterasewere not present?What would lower motor neuron damage be expected to cause? OBrisk reflexes O Numbness O Autonomic dysfunction O Muscle weaknessSomatic reflexes involve the contraction of agonist muscles and relaxation of antagonist muscles. When the agonist muscle is stimulated to contract, the antagonist muscle is inhibited. This relationship is referred to as: O contralateral inhibition O ipsilateral inhibition O reciprocal inhibition O extensor inhibition
- What would a neuropathy of a cervical somatic motor nerve be expected to cause? Brisk reflexes O Numbness Autonomic dysfunction Muscle atrophyIdentify the indicated part of the reflex arc model. NERV OUS S YSTEM reflex arc motor neuron sensory neuron effector O interneuron15) Examine the diagram of a reflex arc shown below. In this case, pain from tissue damage to the hand results in a response where muscles move the hand away from the painful stimulus. ST. gridld.doi vd ehow or2 1o notelvib dot Figure 38-10 Biology; Life on Earth, 8/e © 2008 Pearson Prentice Hall, Inc. barostin 20 a) On the diagram above, label the motor neuron, the sensory neuron, the interneuron, and the effector. b) List any way or ways in which the nervous system will determine the intensity of the pain the example above. Corobral cortex
- FILL IN BLANKS smoothstriatedmany cellsone cell per fiberbranchedlong, straightspindle-shapedautorhythmicinvoluntary/autonomicvoluntary/somatic motorlabel these on knee jerk reaction Multipolar neuron cell body/somaUnipolar neuron cell body/somaDorsal horn of spinal cordVentral horn of spinal cordMotor neuron cell bodyOligodendrocytesSchwann CellsSynapse Part 2EPSPCalcium (Ca2+) channelsPresynaptic neuronPostsynaptic neuronSpecific neurotransmitters (which neurotransmitters are involved in this reflex?)Receptor subtypes (which receptor subtypes are involved in this reflex?)86. All of the following statementsconcerning the corticospinal tract arecorrect EXCEPT:A. Most of the upper motor neuronshave their cell bodies in the precentralgyrusB. Pyramidal tract axons descendthrough the corona radiataC. Upper motor neurons reach theanterior limb of the internal capsuleD. Pyramidal tract separates intobundles in the midbrainE. Uncrossed pyramidal fibers continueas the ventral corticospinal tract
- Autnomic nervous system use arrows to show whether parasympathetic (p) or syspathic (s) fibers stimulate or inhibit or a dash for no parasympathetic interaction for each of the following construction of blood vessels of skin and abdominal viscera 2, salivation and digestive organ contractions 3,Erection or engorgement of genitalia 4, dilation of bronchioles for easier breathing 5, contraction of bladder and relaxation 6,contractions of arrector pill of hair arrector pill of hair follicles causing goose bumps 7,increase in blood glucose level by pancreatic serection coling with stress fight or fight responseThe knee-jerk reflex is often called a stretch reflex because a sharp tap on the patellar ligament stretches the quadriceps femoris, the extensor muscle of the leg. Describe the components and se-quence of events that lead to a “knee jerk.” Why is this reflex sim-pler than most reflex arcs? What is the difference between a reflex arc and a reflex act?Contrast the two major types of descending motor pathways interms of structure and function?