What does “A” represent on the diagram?
a. spleenb. thymusc. axillary lymph node
d. inguinal lymph node
e. thoracic duct

Ventilation refers to the
a. movement of air into and out of the lungsb. gas exchange between the blood and the tissuesc. transportation of oxygen and carbon dioxide in the blood
d. gas exchange between the air in the lungs and the blood
e. respiration at the cellular level

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