The Sensation of Dizziness and the Cardiovascular System
The sensation of dizziness can be described as feeling unsteady and lightheaded or a floating sensation. It may be caused by various factors like neurological disease, allergies, medication usage, or poor circulation. The sensation of dizziness is an indication of low blood flow to the brain (Wu et al., 2018). Most blood (80%) is usually stored in the venous system. Therefore, the amount of blood in the venous system drops, and the amount of blood flowing to the brain also drops, thus causing dizziness. Dizziness is also caused by a physiologic response to gravity, which controls blood flow within the body. When one stands up rapidly, blood in the venous system tends to pool in areas below the heart, thus reducing the blood returning to the heart. When less blood returns to the heart, it cannot pump blood to the highest parts of the body (head and brain) (Wu et al., 2018). When the blood flow to the brain is reduced, it causes dizziness.
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The concepts learned about the structure of the heart offer a better understanding of the circulatory responses during dizziness. It helps understand the role of different heart parts, such as the arteries and veins. Arteries carry blood away from the heart. Therefore, when arteries fail to conduct blood effectively away from the heart, it causes dizziness. On the other hand, veins help carry blood toward the heart (Betts et al., 2013). When the veins are constricted, less blood returns to the heart, and in turn, less blood flows to the brain, thus causing dizziness. Therefore, both veins and arteries influence the sensation of dizziness. Dizziness also affects other body systems, such as the vestibular system, central nervous system, and sensory organs. The vestibular system helps maintain body balance. Dizziness may disrupt the balance. In the central nervous system, dizziness may affect the normal functioning of the cerebellum, which generates vital neurological information for normal body functioning.
References
Betts, J. G., Young, K. A., Wise, J. A., Johnson, E., Poe, B., Kruse, D. H., & DeSaix, P. (2013). Anatomy and physiology. OpenStax. https://openstax.org/books/anatomy-and-physiology/pages/20-1-structure-and-function-of-blood-vessels
Wu, V., Beyea, M. M., Simpson, M. T., & Beyea, J. A. (2018). Standardizing your approach to dizziness and vertigo. J Fam Pract, 67(8), 490-2.
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Respond to the following in a minimum of 175 words:
People will often describe feeling faint or dizzy when they stand up too quickly.
The Sensation of Dizziness and the Cardiovascular System
What do you think is happening within the circulatory system that might cause this to happen?
How do you think what you learned about the structure of the heart might impact this?
How might the other body systems be impacted during this feeling of dizziness?
Chapter 20: The Cardiovascular System: Blood vessels and circulation
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