Describe the respiratory pump
A) The respiratory pump is a mechanism by which a reduction of pressure in the thoracic cavity during inhalation assists venous return to the heart.
B) The respiratory pump is a mechanism by which contraction of the lungs propels blood through the thoracic cavity to the heart.
C) The respiratory pump is a mechanism by which bronchoconstriction propels blood through the thoracic cavity to the heart.
D) The respiratory pump is a mechanism by which an increase in pressure in the thoracic cavity during exhalation pushes blood towards the heart.
E) The respiratory pump is a mechanism by which alternating cycles of bronchiolar constriction and bronchiolar dilation propel blood towards the heart.
Answer: A
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