Which of the following is a waste product of circulation? Venules Oxygen Carbon dioxide Nitrates Question 35 What does the diastolic blood pressure reveal? Pressure in the artery when the ventricles are relaxed Pressure on the tricuspid valve Pressure on the mitral valve Pressure in the artery when the left ventricle is contracting Question 36 What is the pulmonary artery? Artery carrying oxygen-poor blood from the lungs to the heart Artery carrying oxygen-rich blood from the heart to the lungs Artery carrying oxygen-rich blood from the lungs to the heart Artery carrying oxygen-poor blood from the heart to the lungs