rted into bicarbonate ionsIt is stored in the lung tissue       Which chamber of the heart receives oxygen-rich blood from the lungs?Right atriumLeft atriumRight ventricleLeft ventricle       Identify A,B,C and D in the following schematic plan of blood circulation in humans diagram.A) pulmonary vein, B) aorta, C) vena cava, D) pulmonary arteryA) pulmonary artery, B) aorta, C) pulmonary vein, D) vena cavaA) vena cava, B) pulmonary vein, C) aorta, D) pulmonary veinA) aorta, B) pulmonary vein, C) pulmonary artery, D) vena cava       Which chamber of the heart receives deoxygenated blood from the body?Left atriumRight atriumLeft ventricleRight ventricle       What is the term used to describe the circulatory system in vertebrates where blood passes through the heart twice during each cycle?Pulmonary CirculationDouble circulationSystemic CirculationBoth B and C       Which of the following statements about veins is true?Veins have thick walls to withstand high pressure.Veins have thin walls because the blood is no longer under high pressure.Veins lack valves because blood flows under high pressure.Veins only carry oxygenated blood.       What is the primary function of the blood in relation to carbon dioxide?To transport oxygen to body tissuesTo bring carbon dioxide from the rest of the body for release into the alveoliTo deliver nutrients to the cells of the bodyTo carry hormones to target organs of the body       Which of the following statements about the diaphragm is correct?It forms the roof of the chest cavityIt separates the chest from the abdomenIt is made of cartilageIt is responsible for secreting digestive enzymes       What happens to pyruvate when there is insufficient oxygen in muscle cells?It is converted into glucoseIt is converted into lactic acidIt is stored as glycogenIt is released as carbon dioxide