Whenever energy appears in one system, a. it means the system is suitable for creating energy. b. it must have come from somewhere else. c. it must be used quickly or it will be permanently lost. d. it means energy creation has outpaced energy destruction.

Yuan is a firefighter who provides basic first aid at accident scenes. yuan is an emergency medical

What angle should your knees not bend past when squatting? a. 30 degrees b. 45 degrees c. 90 degrees d. 120 degrees

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.