1. What are different factors affecting the detection of stimuli by sensory rece
ID: 81150 • Letter: 1
Question
1. What are different factors affecting the detection of stimuli by sensory receptors? 2. After the damage of the primary motor cortex, a person loses the ability to exert fine control over muscles, but there is still some voluntary control of skeletal muscles left. Explain the basis of the persisting partial motor control after the damage of the primary motor cortex. 3. Classify different receptor types based on their adaptation to stimuli. Give examples for each type. 4. What are the several types of general senses? Briefly describe the anatomy of somatic sensory pathway. Explain why the left side of somatosensory cortex is responsible for sensory perception of right half of body. 5. What is corticospinal pathway? What is its importance in the control of voluntary movements? 6. Briefly discuss the anatomy of sympathetic and parasympathetic system. 7. What is the autonomic nervous system (ANS)? What is the importance of the ANS in the survival of humans. Compare the functions of two subdivisions of the ANS: sympathetic and parasympathetic nervous system. 8. What is receptive field of a sensory receptor? Explain the importance of size of the receptive in localizing a stimulus.Explanation / Answer
2) The motor system is highly complex, composed of many interacting parts at many different organizational levels. In monosynaptic or short loop reflex, afferent neurons are activated by muscle spindles when muscles are stretched. In the spinal cord, these afferent neurons synapse directly onto alpha motor neurons that regulate the contraction of the same muscle. Thus, any stretching of a muscle automatically signals a reflexive contraction of that muscle, without any central control. This is the basis of persisting partial motor control after the damage of primary motor cortex.
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