A child who is experiencing an exacerbation of asthma is brought to the emergency department by his parents. When reviewing the child's laboratory and diagnostic test results, which is consistent with the diagnosis:

A. Hyperinflation of lungs on chest radiograph
B. Increased peak expiratory flow rate
C. Low arterial blood carbon dioxide level
D. Decreased pulmonary function tests

Check all that occur during ventricular systole. a. the av valves open to allow blood to enter the ventricles from the atria. b. the av valves open to allow blood to enter the ventricles from the atria. c. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. d. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. e. the semilunar valves open to allow blood to flow into the large arteries. f. the semilunar valves open to allow blood to flow into the large arteries. g. the av valves close to prevent backflow of blood into the atria.