Biology - Single MCQs (Page 66)

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Q651. Pulmonary trunk and aorta are attached by?...Q652. Pulmonary artery differs from pulmonary vein in having?...Q653. Pericardial space in cockroach is regularly altered by muscles?...Q654. Pericardial fluid is secreted by?...Q655. Pacemaker of heart is?...Q656. Pace maker is situated in heart?...Q657. Pace maker is?...Q658. Oxygenated blood occurs in?...Q659. Oxygenated blood from lungs enters heart through?...Q660. Oxygen carrier in human blood is?...