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Which chamber of the heart receives oxygenated blood from the lungs?
a) Left atrium
b) Right atrium
c) Left ventricle
d) Right ventricle

24. What is the role of the diaphragm in respiration?
a) Pumping blood
b) Exchanging gases
c) Regulating temperature
d) Contracting and relaxing to change lung volume

1 year ago