L4Neural Physiology Chapter 11

L4Neural Physiology Chapter 11 - Neural Physiology: Chapter...

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Neural Physiology: Chapter 11 1. What is meant by integration, and does it primarily occur in the CNS or the PNS? Integration involves processing and interpreting sensory information, and making a decision about motor output. Integration occurs primarily in the CNS. 2. Which subdivision of the PNS is involved in (a) relaying the feeling of a “full stomach” after a meal, (b) contracting the muscles to lift your arm, and (c) increasing your heart rate. (a) This “full stomach” feeling would be relayed by the sensory (afferent) division of the PNS (via its visceral afferent fibers). (b) The somatic nervous system, which is part of the motor (efferent) division of the PNS, controls movement of skeletal muscle. (c) The autonomic nervous system, which is part of the motor (efferent) division of the PNS, controls the heart rate. 3. Which type of neuroglia controls the extracellular fluid environment around neuron cell bodies in the CNS? In the PNS? Astrocytes control the extracellular environment around neuron cell bodies in the CNS, whereas satellite cells perform this function in the PNS. 4. Which two types of neuroglia form insulating coverings called myelin sheaths? Oligodendrocytes and Schwann cells form myelin sheaths in the CNS and PNS, respectively. 5. Which part of the neuron is its fiber? How do nerve fibers differ from the fibers of connective tissue and the fibers in muscle? A nerve fiber is a long axon, an extension of the cell. In connective tissue, fibers are extracellular proteins that provide support. In muscle tissue, a muscle fiber is a muscle cell. 6.
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L4Neural Physiology Chapter 11 - Neural Physiology: Chapter...

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