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The Influence of Respiratory Movements on the Blood Circulation in the Brain and in the Lungs 

The Influence of Respiratory Movements on the Blood Circulation in the Brain and in the Lungs
Chapter:
The Influence of Respiratory Movements on the Blood Circulation in the Brain and in the Lungs
Author(s):

Marcus E. Raichle

DOI:
10.1093/med/9780199358984.003.0009
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date: 26 October 2020

This chapter discusses the influence of respiratory movements on the blood circulation in the brain and in the lungs. Further examples are provided of changes in cerebral pulse due to increased mental activity in contrast to changes produced by deep inspiration. When similar causes (such as heart rate) affect the forearm and the brain, the strongest alteration is seen in the pulse of the brain. The author suggests this is related to the greater vascularity of the brain and more pliable vascular walls. The author extends previous studies to document more fully the changes the cerebral circulation (pulse rate and brain volume) undergoes during deep respiratory inspirations. The correlation between unusually deep and repeated inspirations and lightheadedness (as in blowing into a fire) implies cerebral anemia. The author studies this relationship in more detail. Experiments are carried out on dogs to confirm that blood accumulates in the lungs during inspiration.

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