Which kind of exercise targets muscle cells instead of the cardiovascular system to meet the rapid demand for energy?

So i have a lot of answers answered but it says i still need to answer more questions. why is it doing that? how many questions need to be answered?

Which of the following is a nonspecific defense against pathogens? - b cells - antibodies - t-cells - inflammation

Hot5, endomondo, gympact, and runkeeper are popular a.) energy drinks b.) vigorous-intensity exercise c.) fitness apps d.) moderate-intensity exercise e.) fitness tests