27. Flaccid paralysis is caused by damage to the_ a. dorsal spinal nerves b. upp
ID: 3519005 • Letter: 2
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27. Flaccid paralysis is caused by damage to the_ a. dorsal spinal nerves b. upper motor neurons c. lower motor neurons d. dorsal root ganglion 28. Degeneration of the in the substantia nigra causes Parkinson's disease. a. GABA neurons b. dopamine neurons c. acetylcholine neurons d. myelin sheath 29. Alzheimers disease, a progressive degenerative disease with dementia, involves loss of in the basal forebrain. a. GABA neurons b. dopamine neurons c. acetylcholine neurons d. myelin sheath 30. Which of the following is incorrect? a. Delta brain waves are emitted during deep or slow wave sleep. b. Beta brain waves are emitted when you take a test. c. The axons of sensory neurons enter the spinal cord via the ventral horn. d. Abnormal cerebellum functions cause impaired motor coordination known as ataxia. 31. The portion of the spinal cord controls skeletal muscle movement. b. lateral c. medial d. dorsal 32. This brain region has the motor and sensory decussations (cross over). a. pons b. medulla oblongata c. thalamus d. midbrain 33. Sensory receptors that respond to touch, pressure, vibration, stretch and itch are a. mechanoreceptors b. nociceptors c. proprioceptors d. chemoreceptors 34. Which of the following is incorrect regarding the knee jerk reflex? a. It is voluntary movement under the control of the cerebellum. b. It is important for maintaining a standing position. c. It is commonly tested to check for nerve damage. d. The sensory receptor involved in this reflex is stretch receptors.Explanation / Answer
27. C. Lower motor neuron.
Flaccid paralysis have multiple causes such as infection due to virus especially polio virus , botulism , poisoning to certian susbtances and lower motor neuron lesion.
28. C. Dopamine neurons.
In parkinson disease, there occurs damage to basal ganglia which affects dopamine secreting neurons in the substantia nigra.
29. C. Acetylcholine neurons.
Alzheimer's disease is beleived to be caused due to loss of acetylcholine neurons leading to reduced production of neurotransmitter acetylcholine.
30. C.
The ventral roots allow motor neurons to exit the spinal cord and dorsal roots allow sensory neuron to enter the spinal cord.
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