Human Anatomy & Physiology (9th Edition)

Published by Pearson
ISBN 10: 0321743261
ISBN 13: 978-0-32174-326-8

Chapter 12 - The Central Nervous System - Review Questions - Page 481: 37b


A cerebrovascular accident or stroke is caused by impairment of the blood supply to brain tissue. Some causes: 1. Clots that form outside the heart and travel to brain 2. Narrowed blood vessels that are due to atherosclerosis 3. Ischemia due to compression of the brain because of edema or disease. Some consequences include: Paralysis on one side ( hemiplegia); sensory deficits. difficulties in speaking or understanding speech

Work Step by Step

CVAs or strokes are due to loss of circulation to certain areas of the brain. The ischemia that results causes death of neurons due to hypoxia and loss of nutrients. If the blockage of the blood supply is limited and brief ( 5-50 mins,) it is called a TIA or transient ischemic attack. A large CVA may result in partial paralysis. A more limited one may cause numbness, mild regional paralysis, impaired speech, sensory deficit, and difficulties in understanding speech.
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