Final answer:
Option B. is correct. The term 'AV valves opened' does not belong because during ventricular systole, the AV valves are closed to prevent backflow of blood, while the semilunar valves are open to allow blood ejection.
Step-by-step explanation:
The term that does not belong in the context of the heart's function during the cardiac cycle is b. AV valves opened. This is because during ventricular systole, which is the phase in the cardiac cycle when the ventricles contract, the atrioventricular (AV) valves are closed to prevent backflow of blood into the atria. During this phase, the semilunar valves are open, allowing blood to be ejected from the ventricles into the aorta and pulmonary artery.
The AV valves, also known as atrioventricular valves, include the tricuspid valve and the mitral valve. These valves close when the ventricles contract, preventing backflow of blood into the atria. In contrast, semilunar valves like the aortic and pulmonary valves open during ventricular systole to allow blood to be ejected from the ventricles into the aorta and pulmonary trunk, respectively.