ANATOMY
LIMB VASCULATURE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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helps buffer acid-base balance
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inspiration helps move venous blood from the abdomen to the vena cava
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blood flows back from intrathoracic veins to intraabdominal veins during expiration
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intraabdominal veins refill during expiration
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Detailed explanation-1: -Expiration occurs when the diaphragm relaxes. This applies pressure to the thoracic cavity as it lengthens and becomes domed again, and the air is pushed out of the lungs. The external intercostal muscles also relax during expiration. The contraction and relaxation of the diaphragm change thoracic cavity volumes.
Detailed explanation-2: -Respiratory pump When muscles contract and relax during the inspiration and expiration process, pressure changes occur in the thoracic and abdominal cavities. These pressure changes compress the nearby veins and assist blood return to the heart.
Detailed explanation-3: -Expiration. Expiration (exhalation) is the process of letting air out of the lungs during the breathing cycle. During expiration, the relaxation of the diaphragm and elastic recoil of tissue decreases the thoracic volume and increases the intraalveolar pressure.