Base your answers to questions 21 and 22 on the chart below which represents the concentration of gases in inhaled and exhaled air in humans and on your knowledge of biology Concentration of Gases O2 CO 20 9 Inhaled air Exhaled air 5 60 21 A conclusion that may correctly be drawn from the chart is that 14 0 0 04 N2 A the percent of carbon dioxide in the exhaled air depends on the percent of nitrogen gas used B the percent of oxygen in the exhaled air depends on the percent of nitrogen gas used C neither carbon dioxide nor oxygen is used in the metabolic processes of humans D nitrogen gas is not used in the metabolic processes of humans A capillaries C arteries 79 0 22 What is the reason for the difference in the O2 and CO2 concentrations of inhaled and exhaled air 79 0 A In cellular respiration CO2 is used and O2 is produced B In cellular respiration O2 is used and CO2 is produced C O2 and CO2 diffuse easily because they are large molecules D O2and CO2 are actively transported across thin moist membranes A producing antibodies B removing carbon dioxide C engulfing and destroying bacteria D identifying invaders for destruction 23 Which activity is not a response of human white blood cells to pathogens B ventricles D veins 4 Dissolved nutrients wastes and oxygen are exchanged between the blood and intercellular fluid through the walls of Base your answers to questions 25 through 27 on the diagram below which represents a portion of the human circulatory system and on your knowledge of biology Right Lung 8 5 Heart 25 Which chamber of the heart pumps deoxygenated blood to the lungs A 1 B 2 C 3 D 4 26 Which chamber of the heart receives oxygenated blood from the lungs Left Lung A 1 B 2 C 3 D 4 27 Which number represents a capillary bed which allows for the diffusion of nutrients from the blood A 6 B 5 C 8 D 7 A arteriole C capillary 28 Which type of vessel normally contains valves that prevent the backward flow of materials B artery D vein 29 The concentration of oxygen is highest in the blood flowing through the 26 27 A arthritis C angina pectoris A pulmonary vein B inferior vena cava BALIO C pulmonary artery D superior vena cava 30 Which condition has been linked to a diet that is high in saturated fats B emphysema D mental retardation