20. Which of the following is the most (largest) muscular chamber in a bird's heart or a mammal heart? a. right atrium b. left atrium c. right ventricle d. left ventricle e. all are equality muscular 21. Materials are exchanged between the blood and the surrounding tissues in the a. arteries b. veins d. all of the choices e. none of the choices c. capillaries 22. Oxygenated blood leaves the human heart via the a. pulmonary vein b. pulmonary artery d. aorta e. respiratory circuit С. yena caya

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